Physics 1-7
A lack of precision in scientific measurements typically arises from A. Limitations of the measuring instrument B. Human error C. Lack of calibration D. Too many significant figures
A
A bag of sports equipment has a mass of 10.0 kilograms and a weight of A. 0.98 N B. 9.8 N C. 98 N D. 980 N E. None of the above
C
A ball is thrown straight up. At the top of its path its acceleration is A. 0 m/s/s B. About 5 m/s/s C. About 10 m/s/s D. About 20 m/s/s E. About 50 m/s/s
C
A car starts from rest and after 7 seconds it is moving at 42 m/s. What is the car's average acceleration? A. 0.17 m/s/s B. 1.67 m/s/s C. 6 m/s/s D. 7 m/s/s E. None of the above
C
A force of 3 N accelerates a mass of 3 kg at the rate of 1 m/s/s. the acceleration of a mass of 6 kg acted upon by a force of 6 N is A. Twice as much B. Half as much C. The same D. None of the above
C
A hiker uses a compass to navigate through the woods. Identify the area of physics that involves this. A. Thermodynamics B. Relativity C. Electromagnetism D. Quantum mechanics
C
A jumbo jet cruises at a constant velocity when the total thrust of the engines on the jet is about 50,000 N. How much air resistance acts on the jet? A. 0 N B. 25, 000 N C. 50, 000 N D. 75, 000 N E. 100, 000 N
C
The force required to maintain an object at a constant speed in free space is equal to A. The mass of the object B. The weight of the object C. Zero D. The force required to stop it E. None of the above
C
The most appropriate SI unit for measuring the length of an automobile is the A. Micron B. Kilometer C. Meter D. Nanometer
C
The mass of a lamb that weighs 110 N is about A. 1 kg B. 11 kg C. 110 kg D. 1100 kg E. None of the above
B
A 20-N falling object encounters a 4 N of air resistance. The magnitude of the net force on the object is A. 0 N B. 4 N C 16 N D. 20 N E. None of the above
C
A 6-N falling object encounters 6 N of air resistance. The magnitude of the net force on the object is A. 0 N B. 6 N C 12 N D. None of the above
A
A ball is thrown straight up. At the top of its path its instantaneous speed is A. 0 m/s B. About 5 m/s C. About 10 m/s D. About 20 m/s E. About 50 m/s
A
A book weighs 4 N. When held at rest in your hands, the net force on the book is A. 0 N B. 0.4 N C. 4 N D. 39 N E. None of the above
A
A box is dragged without acceleration in a straight-line path across a level surface by a force of 13 N. What is the frictional force between the box and the surface? A. 13 N B. Less than 13 N C. More than 13 N D. Need more information to say
A
A force is exerted on the tires of a car to accelerate the car along the road. The force is exerted by the A. Road B. Engine C. Tires D. Air
A
A piece of chalk is dropped by a teacher walking at a speed of 1.5 m/s. From the teacher's perspective, the chalk appears to fall A. Straight down B. Straight down and backward C. Straight down and forward D. Straight backward
A
A player hits a ball with a bat. The action force is the impact of the bat against the ball. What is the reaction to this force? A. The force of the ball against the bat B. The weight of the ball C. Air resistance on the ball D. The grip of the payer's hand against the bat E. None of the above
A
A science teacher, an art instructor, and a religious studies teacher are arguing about their respective disciplines. Which of the following could be a claim that each teacher makes? A. The goal of mine is to search for order and meaning in the world. B. The goal of mine is to discover and record natural phenomena. C. The goal of mine is to describe human experiences. D. The goal of mine is to worship a supreme being.
A
A train travels 6 meters in the first second of travel, 6 meters again during the second second of travel, and 6 meters again during the third second. Its acceleration is A. 0 m/s/s B. 6 m/s/s C. 12 m/s/s D. 18 m/s/s E. None of the above
A
Accelerations are produced by A. Forces B. Velocities c. Accelerations D. Masses E. None of the above
A
After a cannonball is fired into frictionless space, the amount of force needed to keep it going equals A. Zero, since no force is necessary to keep it moving B. Twice the force with which it was fired C. One half the force with which it was fired D. The same amount of force with which it was fired E. One quarter the force with which it was fired.
A
An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the A. Arrow's push against the bowstring B. Weight of the arrow C. Friction of the ground against the archer's feet D. Air resistance against the bow E. Grip of the archers hand on the bow
A
As a ball falls, the action force is the pull of Earth's mass on the ball. What is the reaction to this force? A. The pull of the ball's mass on Earth B. The acceleration of the ball C. Nonexistent in this case D. Air resistance acting against the ball E. None of the above
A
IN the steps of the scientific method, what is the next step after formulating and objectively testing hypotheses? A. Interpreting results B. Stating conclusions C. Conducting experiments D. Making observations and collecting data
A
If a horse pulls on a wagon at rest the wagon pulls back equally on the horse. Can the wagon be set into motion? A. Yes, because there is a net force acting on the wagon B. Yes, because there is a time delay between the action and reaction C. No, because the forces cancel each other D. Yes, because the horse's pull on the wagon is larger than the wagon's pull on the horse
A
If you drop a stone into a hole drilled all the way to the other side of Earth, the stone will A. Speed up until it gets to the center of the Earth B. Slow Down until it reaches the center of Earth C. Speed up until it reaches the other side of Earth D. Stop at the center of Earth
A
If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh A. More B. Less, but more than zero C. The same D. Zero
A
In the absence of air resistance, at what other angle will a thrown ball go the same distance as one thrown at an angle of 75 degrees? A. 15 degrees B. 65 degrees C. 70 degrees D. 80 degrees E. 90 degrees
A
One difference between a hypothesis and a theory is that a hypothesis A. Is a guess that has not been well tested, whereas a theory is a synthesis of well-tested guesses B. Is testable, whereas a theory is not testable C. Can be revised, whereas a theory cannot be revised D. Is not testable, whereas a theory is testable
A
Suppose a car is moving in a straight line and steadily increases its speed. It moves from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the car's acceleration? A. 5 km/h * s B. 10 km/h * s C. 35 km/h * s D. 40 km/h * s E. 45 km/h * s
A
What is the minimum resultant possible when adding a 5-N force to an 8-N force? A. 5 N B. 3 N C. 8 N D. 13 N E. 40 N
A
When there is no air resistance, objects of different masses dropped from rest A. Fall with equal accelerations and with equal displacements B. Fall with different accelerations and with different displacements C. Fall with equal accelerations and with different displacements D. Fall with different accelerations and with equal displacements
A
Where does a satellite in an elliptical orbit have the greatest kinetic energy? A. At the point closest to the planet B. Exactly at the point halfway to the planet C. At the point farthest from the planet D. Anywhere - its kinetic energy is constant E. More information is needed
A
Which of the following is NOT a unit of rotational speed? A. Meters per second B. Revolutions per minute C. Revolutions per second D. Rotations per second E. Rotations per minutes
A
Which of the following physical quantity has both magnitude and direction? A. Vector B. Scalar C. Resultant D. Frame of reference
A
A karate chop delivers a blow of 2300 N to a board that breaks. The force that acts on the hand during this feat A. Is less than 2300 N B. Is 2300 N C. Is more than 2300 N D. Cannot be determined
B
A 15-N force and a 45-N force act on an object in opposite directions. What is the net force on the object? A. 15 N B. 30 N C. 45 N D. 60 N E. None of the above
B
A 4.0-kg ball has a momentum of 20.0 kg*m/s. What is the ball's speed? A. 0.2 m/s B. 5 m/s C. 20 m/s D. 80 m/s E. None of the above
B
A baker makes a loaf of bread. Identify the area of physics that this involves. A. Optics B. Thermodynamics C. Mechanics D. Relativity
B
A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball's path does it experience zero velocity and nonzero acceleration at the same time? A. Midway on the way up B> At the top of its path C. The instant it leaves the catcher's hand D. The instant before it arrives in the catcher's mitt
B
A girl pulls on a 10-kg wagon with a constant force of 20 N. What is the wagon's acceleration? A. 0.5 m/s/s B. 2 m/s/s C. 10 m/s/s D. 20 m/s/s E. 200 m/s/s
B
A girl whose weight is 500 N hangs from the middle of a bar supported by two vertical strands of rope. What is the tension in each strand? A. 0 N B. 250 N C. 500 N D. 750 N E. 1000 N
B
A high school student hits a nail with a hammer. During the collision, there is a force A. On the nail but not on the hammer B. On the nail and also on the hammer C. On the hammer but not on the nail
B
A hypothesis is A. The long side of a right triangle. B. An educated guess that has yet to be proven by experiment. C. Close agreement by competent observers of observations of the same phenomena. D. A guess that had been tested over and over again and always found to be true. E. A synthesis of a large collection of information that includes guesses.
B
A jet moving at 500 km/h due east is in a region where the wind is moving at 120 km/h in a direction 30 degrees north of east. What is the speed of the aircraft relative to the ground? A. 620.2 km/h B. 606.9 km/h C. 588.7 km/h D. 511. 3 km/h
B
A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. What is the reaction to this force? A. The muscular effort in the player's arm B. The force the glove exerts on the ball C. Friction of the ground against the player's shoes D. The player's grip on the glove E. None of the above
B
A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kg brick, one would have to push A. With 100 times force B. With 10 times as much force C. With just as much force C. With just as much force D. With 1/10 the amount of force E. None of the above
B
A scalar quantity has A. Only direction. B. Only magnitude. C. Both magnitude and direction. D. Neither magnitude nor direction.
B
A theory is A. An educated guess that has yet to be proven by experiment B. A synthesis of a large collection of information including well-tested guesses C. Close agreement by competent observers of observations of the same phenomena D. A guess that has been tested over and over again and always found to be true E. A science story about atoms and molecules
B
According to the scientific method, why does a physicist make observations and collect data? A. To decide which parts of a problem are important B. To ask a question C. To make an interpretation D. To solve all problems
B
An object has a constant mass. A constant force on the object produces constant A. Velocity B. Acceleration C. Both A and B D. None of the above
B
An object weighs 30 N on Earth. A second object weighs 30 N on the moon. Which has the greater mass? A. The one on Earth B. The one on the moon C. They have the same mass D. Not enough information to say
B
An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the bug, the force of the bug on the car is A. Larger B. The same C. Smaller D. Need more information to say
B
Bronco the skydiver falls toward Earth. The attraction of Earth o Bronco pulls him down. The reaction the this force is A. Bronco finally pushing against Earth's surface B. Bronco pulling up on Earth C. Earth's surface finally pushing against Bronco D. None of the above
B
Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane? A. The ball would not roll up the other plane at all. B. To nearly its original height. C. To about one quarter its original height. D. To nearly twice its original height. E. To nearly half its original height.
B
If a projectile is fired straight up at a speed of 30 m/s, the total time to return to its starting point is about A. 3 seconds B. 6 seconds C. 30 seconds D. 60 seconds E. Not enough information to estimate.
B
If a truck has ten times the mass of a car and the two vehicles are pushed with an equal force, you would expect the acceleration of the truck to be A. 1/100 times that of the car B. 1/10 times that of the car C. 10 times that of the car D. 100 times that of the car
B
If shopping cart A has five times more mass in it than shopping cart B and the two carts are pushed with equal forces, you can expect the acceleration of shopping cart A to be A. 1/25 times that of shopping cart B B. 1/5 times that of shopping cart B C. 5 times that of shopping cart B D. 25 times that of shopping cart B
B
If you rule a tin can on the end of a strung and the string suddenly breaks, the can will A. Fly off directly away from you. B. Fly off, tangent to its circular path. C. Fly directly toward you. D. Spiral in toward your hand. E. Spiral away from your hand.
B
Nellie Newton swings a rock into a circular path while holding an attached string overhead. The string makes a 45-degree angle to the vertical (comprising a "conical pendulum"). The centripetal force that holds the rock in its circular path is the A. Vertical component of the string tension. B. Horizontal component of the string tension. C. Tension in the string. D. None of the above.
B
Science, art, and religion do not contradict one another because A. If you choose religion and art, you can forget about science. B. All three have different domains. C. If you choose the right one, you can forget about the other two. D. If you choose science, you can forget about religion and art.
B
Since Earth is attracted to the sun, why doesn't it fall into the sun? A. Because it has too much mass to move toward the sun. B. Because it has sufficient tangential velocity. C. Because there is an equal force holding it away from the sun. D. Because it has too much inertia to move toward the sun. E. All of the above.
B
Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the cart's mass doubles, what happens to the cart's acceleration. A. It quarters B. It halves C. It stays the same D. It doubles E. It quadruples
B
Suppose two people, one having three times the mass of the other, pull on opposite side of a 20 meter rope while on frictionless ice. After a brief time, they meet. The more mass person slides a distance of A. 4 m B. 5 m C. 6 m D. 7 m
B
The astronomer Copernicus publicly stated in the 1500s that Earth A. Does not move B. Revolves around the sun C. Is slowing down D. Moves in a straight line E. Is the center of the solar system
B
The radius of Earth is 6,370,000 m. Express this measurement in km in scientific notion with the correct number of significant figures. A. 6.37 x 10^6 km B. 6.37 x 10^3 km C.. 637 x 10^3 km D. 63.7 x 10^4 km
B
The terminal speed for a person parachuting (with the chute open) is about A. 0 km/h B. 15 km/h C. 150 km/h D. 1500 km/h
B
The two people pull on a rope in a tug-of-war. Each pulls with 400 N of force. What is the tension in the rope? A. 0 N B. 400 N C. 600 N D. 800 N E. None of the above
B
The unit of pressure is A. Newtons per meter B. Newtons per square meter (or pascals) C. The newton D. The meter E. Meters per second squared
B
They symbol "mm" represents a A. Micrometer B. Millimeter C. Megameter D. Manometer
B
Two objects, A and B, have the same size and shape, but A is twice as heavy as B. When they are dropped simultaneously from a tower, they reach the ground at the same time, but A has a higher A. Acceleration B. Momentum C. Speed D. All the above E. None of the above
B
Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the opposite direction to that of the first object. A. Sometimes True B. Always True C. Always false
B
Which of the following is a physical quantity that has a magnitude but no direction A. Vector B. Scalar C. Resultant D. Frame of reference
B
Which of the following is a problem that some people blame on technology? A. Improved transportation B. Widespread pollution C. Reduction of acid rain D. Economic growth
B
Which of the following is a reason to express scientific findings mathematically? A. The findings become more difficult to prove by experiment. B. The findings become easier to verify by experiment. C. The findings become more confusing. D. The findings become less appealing to the public.
B
Which of the following is an area of physics that studies motion and its causes? A. Thermodynamics B. Mechanics C. Quantum mechanics D. Optics
B
Which of the following is an example of projectile motion? A. A jet lifting off a runway B. A thrown baseball C. An aluminum can dropped straight down into the recycling b in D. A space shuttle being launched
B
Which one of the following steps is NOT a part of the scientific method? A. Perform experiments to test the predictions. B. Repeat the experiments until the answers match the predictions. C. Formulate a general rule based on the predictions and experimental outcome. D. Make a guess about the answer to a problem and predict its consequences. E. Recognize a problem.
B
You and a friend are jumping on a trampoline. Why does Earth, which is rapidly orbiting around the sun, not move under your feet when you jump? A. There are different rules in space and on the surface of the earth. B. Newton's first law holds that your body moves along with Earth because it is not compelled to change its motion by an unbalanced force. C. Newton's second law holds that the acceleration produced by the force of gravity is offset by the force of friction on your feet. D. Newton's third law holds that there is an equal and opposite force exerted by the trampoline on you feet, which allows you to move with Earth through space.
B
You are helping your aunt move a piano on wheels from one room to another. When you push the piano horizontally, it moves at constant speed. What can you say about the piano? A. It is in static equilibrium. B. It is in the dynamic equilibrium. C. It is in equilibrium because it doesn't experience a friction force. D. It is in equilibrium because it experiences net force opposite to the friction force.
B
You are on a frozen pond, and the ice starts to crack. If you lie down on the ice and begin to crawl. this will A. Increase the pressure on the ice B. Decrease the pressure on the ice C. Increase the total force on the ice D. Decrease the total force on the ice
B
You pull horizontally on a 50-kg crate with a force of 450 N and the friction force on the crate is 250 N. The acceleration of the crate is A. 2 m/s/s B. 4 m/s/s C. 9 m/s/s D. 14 m/s/s
B
A 2-kg ball is thrown at 3 m/s. What is the balls momentum? A. 2 kg*m/s B. 3 kg*m/s C. 6 kg*m/s D. 9 kg*m/s E. None of the above
C
A passenger on a bus is moving east sees a man standing on a curb. From the passenger's perspective, the man appears to A. Stand still B. Move west at a speed that is less than the bus's speed C. Move west at a speed that is equal to the bus's speed D. Move east at a speed that is equal to the bus's speed
C
A ring and a disk roll down a hill together. Which reaches the bottom first? A. Both reach the bottom at the same time. B. Depends on the moments of inertia. C. The disk D. Depends on the masses E. The ring
C
A scientific fact is A. Something you believe is true because you have been taught it B. A guess that has been tested over and over again and always found to be true C. Close agreement by competent observers of observations of the same phenomena D. An educated guess that has yet to be proven by experiment E. A synthesis of a collection of data that includes well-tested guesses
C
A sheet of paper can be withdrawn from under a container of milk without topline it if the paper is jerked quickly. The reason this can be done is that A. Gravity pulls very hard on the milk carton B. The milk carton has very little weight C. The milk carton has inertia D. None of the above
C
A tow truck exerts a force of 2000 N on a car, accelerating it at 1 m/s/s. What is the mass of the car? A. 667 kg B. 1000 kg C. 2000 kg D. 8000 kg E. None of the above
C
A woman weighing 550 N sits on the floor. She exerts a force on the floor of A. 5.5 N B. 55 N C. 550 N D. 1100 N E. 5500 N
C
A woman weighing 550 N sits on the floor. She exerts a force on the floor of A. 5.5 N B. 55 N C. 550 N D. 1100 N E. 5500 N
C
According to Newton's third law, if you push gently on something, it will push A. Gently on something else B. On you and only if you aren't moving C. Gently on you D. One something only under the right conditions
C
According to the scientific method, how does a physicist formulate and objectively test hypotheses? A. By defending an opinion B. By interpreting graphs C. By experiments D. By stating conclusions
C
An apple weighs ! N. The net force on the apple when it is in free fall is A. 0 N B. 0.1 N C. 1 N D. 9.8 N E. None of the above
C
An object following a straight-line path at constant speed A. Has no forces acting on it B. Has a net force acting on it in the direction of motion C. Has zero acceleration D. Must be moving in a vacuum E. None of the above
C
As a satellite is moving in orbit around te Earth, the sum of the kinetic energy and potential energy everywhere is A. Decreasing B. Increasing C. Constant D. Zero
C
Diagrams are NOT designed to A. Show relationships between concepts B. Show setups of experiments C. Measure an event or a situation D. Label parts of a model
C
Earth pulls on the moon and similarly the moon pulls on Earth. This is evidence that the A. Earth and moon are simply pulling on each other B. Earth's and moon's pulls comprise an action-reaction pair C. Both A and B D. Neither A nor B
C
For the winter, a duck flies 10 m/s due south against a gust of wind with a speed of 2.5 m/s. What is the resultant velocity of the duck? A. 12.5 m/s south B. -12.5 m/s south C. 7.5 m/s south D. -7.5 m/s south
C
Forces always occur A. As single quantities. B. By themselves. C. In pairs. D. In triplets.
C
If the force of gravity suddenly stopped acting on the planets, they would A. Spiral slowly towards the sun B. Continue to orbit the sun C. Move in straight lines tangent to their orbits D. Spiral slowly away from the sun E. Fly straight away from the sun
C
If the sun were to collapse to form a black hole (quite unlikely), Earth would A. Immediately disappear B. Spiral into the black hole C. Orbit the black hole just as it orbits the sun now D. leave the solar system in the direction of its tangential velocity to be drawn into the black hold E. Be drawn into the black hole
C
If you exert a force of 12,000 N on a 3,000 kg car and a 6,000 kg truck that are both originally at reast, what will be the resulting accelerations of the objects? A. The car and the truck will both accelerate 12,000 m/s/s B. The car will accelerate 1/4 m/s/s and the truck will accelerate 1/2 m/s/s C. The car will accelerate 4 m/s/s and the truck will accelerate 2 m/s/s D. The car will accelerate 36,000,000 m/s/s and the truck will accelerate 72,000,000 m/s/s
C
If you exert a force of 12,000 N on a 3000 kg car and a 6000 kg truck that are both originally at rest, wheat will be the resulting accelerations of the objects? A. The car and the truck will both accelerate 12, 000 m/s/s. B. The car will accelerate 1/4 m/s/s and the truck will accelerate 1/2 m/s/s. C. The car will accelerate 4 m/s/s and the truck will accelerate 2 m/s/s. D. The car will accelerate 36,000,000 m/s/s and the truck will accelerate 72, 000,000 m/s/s.
C
Listening to your favorite radio station involves which area of physics? A. Optics B. Thermodynamics C. Vibrations and wave phenomena D. Relativity
C
One object has twice as much mass as another object. The first object also has twice as much A. Velocity B. Gravitational acceleration C. Inertia D. All of the above
C
Suppose you accidentally drive your car into a tree. Which of the following correctly describe the interaction between your car and the tree? A. The car and the tree mutually exert equal forces in the same direction. B. The car and the tree mutually exert different forces in the same direction. C. The car and the tree mutually exert equal and opposite forces on each other. D. The car and the tree mutually exert different and opposite forces on each other.
C
Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 miles per hour. Which of the following is NOT true? A. You and the car are accelerating. B. Your acceleration is constantly changing. C. Your velocity is constant. D. Your direction is constantly changing. E. Your speed is constant .
C
The SI unit used to measure mass is the A. Meter B. Second C. Kilogram D. Liter
C
The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air resistance, is that A. They have the same mass B. The ball with the larger force has the smaller mass C. The ball with the larger force also has the larger mass D. The force acting on them is the same time E. None of above
C
The vertical height attained by a basketball player who achieves a hang time of a full one second is about A. 0.8 m B. 1 m C. 1.2 m D. 2.5 m E. More than 2.5 m
C
What is needed to describe a vector quantity? A. Only magnitude B. Only direction C. Both magnitude and direction D. Neither magnitude nor direction
C
What two dimensions, in addition to mass, are commonly used by physicists to derive additional measurements? A. Length and width B. Area and mass C. Length and time D. Velocity and time
C
Which of the following is NOT an example of projectile motion? A. A volleyball served over the net B. A baseball hit by a bat C. A hot-air balloon drifting toward Earth D. A long jumper in action
C
Which would fall with greater acceleration in a vacuum - a leaf or a stone? A. The leaf B. The stone C. They would hit the ground at the same time D. They would be suspended in a vacuum
C
Which would hit the ground first if dropped from the same height in a vacuum - a feather or a metal bolt? A. The feather B. The metal bold C. They would hit the ground at the same time. D. They would be suspended in a vacuum.
C
Why do physicists use models? A. To explain the complex features of simple phenomena B. To describe all aspects of a phenomenon C. To explain the basic features of complex phenomena D. To describe all of reality
C
You drive past a farm, and you see a cow pulling a plow to till a field. You have just learned about Newton's third law, and you wonder how the cow is able to move forward if the plow is exerting an equal and opposite force on the cow. Which of the following explains the movement of the cow and the plow? A. The force exerted by the cow on the plow is equal to the force that he cow exerts on the ground to move forward. B. The force exerted by the cow on the plow is larger than the force that he cow exerts on the ground to move forward. C. The force exerted by the cow on the plow is smaller than the force that the cow exerts on the ground to move forward. D. More information is needed to answer this question.
C
A 5-N force and a 30-N force act in the same direction on an object. What is the net force on the object? A. 5 N B. 25 N C. 30 N D. 35 N E. None of the above
D
A freight train rolls along a track with considerable momentum. If it were to roll at the same speed but had twice as much mass, its momentum would be A. Zero B. Unchanged C. Quadrupled D. Doubled
D
A jet has a mass of 40, 000 kg. The thrust for each of the four engines is 20,000 N. What is the jet's acceleration when taking off? A. 0.3 m/s/s B. 0.5 m/s/s C. 1 m/s/s D. 2 m/s/s E. None of the above
D
A speeding truck locks its brakes and it skids to a stop. If the truck's total mass were doubled, its skidding distance would be A. Half as far B. Nearly as far, but not quite C. The same D. Twice as far E. Four times as far
D
A sportscar has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the magnitude of the force actin on the sportscar? A. 300 N B. 1500 N C. 2250 N D. 7500 N E. None of the above
D
Angular momentum is defined as A. Momentum times rotational velocity. B. Mass times velocity. C. Rotational inertia times linear velocity. D. None of the above.
D
As a 600 N woman sits on the floor, the floor exerts a force on her of A. 6 N B. 60 N C. 1200 N D. 600 N E. 6000 N
D
Friction A. Comes from microscopic bumps that act as obstructions to the object's motion. B. Is the name given to the force acting between surfaces sliding past one another. C. Acts in a direction that opposes the motion of an object. D. All of the above. E. None of the above.
D
How does a scientist reduce the frequency of human error and minimize a lack of accuracy? A. Take repeated measurements B. Use the same method of measurement C. Maintain instruments in good working order D. All of the above
D
How much does a 3-kg bag of bolts weigh? A. 7.2 N B. 14.4 N C. 22.8 N D. 29.4 N E. 58.8 N
D
How much force is needed to accelerate a 4-kg physics book to an acceleration of 2 m/s/s? A. 0 N B. 2 N C. 0.5 N D. 8 N E. 24 N
D
If the force actin on a cart doubles, what happens to the cart's acceleration A. It quarters B. It halves C. It stays the same D. It doubles E. It quadruples
D
If you know the acceleration of a car, its initial velocity, and the time interval, which of the following can you predict? A. The direction of the car's final velocity B. The magnitude of the car's final velocity C. The displacement of the car D. All of the above
D
If you were to weigh yourself in an elevator that is in free fall, compared to your ordinary weight, you would weigh A. More B. The same C. Less, but more than zero D. Zero
D
If your car runs out of gas, why can't you push on the car's windshield from inside to move it? A. In order for the car to move, a force must be exerted by you on the car's windshield. B. In order for the car to move, a force must be exerted by the car's windshield on you. C. IN order for the car to move, an outside force must be exerted on the car. D. In order for the car to move, a force must be exerted by the car on the ground.
D
In order to find the components of a vector, you should A. Draw a vector with the correct magnitude and orientation. B. Measure the sides of the rectangle. C. Draw a rectangle so that the vector is the diagonal. D. All of the above.
D
In order to find the components of a vector, you should A. Draw the vector with correct magnitude and orientation. B. Measure the sides of the rectangle. C. Draw a rectangle so that the vector is the diagnol. D. All of the above
D
Nellie Newton holds an apple in her hand. If the action is Earth pulling on the apple, then the reaction is A. Her hand providing a normal force on the apple B. Her hand pushing up on the apple C. Both A and B D. Neither A nor B
D
One way that astronomers detect planets around distant starts is by observing to see if there is a _________ in the light that reaches us from a particular star. The reason that the star moves away or toward us is a _________ due to the gravitational effects of the planet. A. Signal, contraction B. Doppler shift, contraction C. Signal, perturbation D. Doppler shift, perturbation
D
Pressure is defined as A. Time per area B. Velocity per time C. Force per time D. Force per area E. Distance per time
D
Suppose the gravitational force between two masses is 70 N. If the magnitude of one of the masses halves, what is the force between the masses? A. 280 N B. 140 N C. 70 N D. 35 N E. 18 N
D
The SI unit for time is A. 1 day B. 1 hour C. 1 minute D. 1 second
D
The acceleration produced by a net force on an object is A. Inversely proportional to the mass of the object B. Directly proportional to the magnitude of the net force C. In the same direction as the net force D. All of the above E. None of the above
D
The gravitational force between two massive spheres A. Is always an attraction B. Depends on how massive they are C. Depends inversely on the square f the distances between them. D. All of the above.
D
The weight of a person can be represented by a vector that acts A. In a direction that depends on where the person is standing B. Perpendicular to the ground underneath the person C. Parallel to the ground D. Straight down, even if the person is standing on a hill E. All of the above
D
To test a scientific hypothesis you would A. Use the results of only the experiments that confirm the hypothesis B. Set up an experiment and look at the results C. Find the best result and report only that result D. Set up many experiments and look at the results E. Perform any physics experiment and look at the results
D
What is the maximum resultant possible when adding a 2-N force to an 8-N force? A. 2 N B. 6 N C. 8 N D. 10 N E. 16 N
D
When an ice skater pulls in his hands to turn faster A. angular momentum must be conserved. B. His moment of inertia changes. C. His rotational speed changes. D. All of the above.
D
Which of the following is NOT true about Aristotle's concept of "violent motion"? A. "Violent motion" is imposed motion B. "Violent motion" has an external cause C. "Violent motion" is the result of forces that push or pull D. "Violent motion" is thought to be either straight up or straight down
D
Which of the following is the motion of objects moving in two dimensions under the influence of gravity? A. Horizontal velocity B. Directrix C. Vertical velocity D. Projectile motion
D
Which statement about models is NOT correct? A. Models describe only part of reality. B. Models help build hypotheses. C. Models help guide experimental design. D. Models manipulate a single variable or factor in an experiment.
D
A barge is being pulled along a canal by two ropes that make equal angles with the direction in which the barge points. Assuming the two pulls on the barge are equal, in what direction does the barge move? A. It oscillates back and forth between the two banks. B. It moves straight ahead. C. It moves in the direction of the resultant force on it. D. Both A and B E. Both B and C
E
Equilibrium occurs when A. All the forces acting on an object are balanced. B. The sum of the +X forces on an object equals the sum of the -X forces. C. The net force on the object is zero. D. The sum of the upward forces equals the sum of the downward forces. E. All of the above.
E
Physics is the most basic science because A. The foundation of biology is chemistry and the foundation of chemistry is physics. B. It is about the nature of basic things like forces, energy, and motion. C. The ideas of physics extend into more complex sciences. D. You can better understand science in general if you understand physics. E. All of the above.
E
Suppose a jumper claims a hang time of 2 seconds. Then that jumper must be able to jump a vertical distance of A. 1 m B. 2 m C. 3 m D. 4 m E. 5 m
E
Suppose the gravitational force between two massive spheres is 100 N. If the distance between the spheres is doubled, what is the force between the masses? A. 400 N B. 200 N C. 100 N D. 50 N E. 25 N
E
The difference between a hypothesis and a theory is that a hypothesis is A. Never true whereas a theory is always true B. True whereas a theory is not true C. An isolated fact whereas a theory is a huge collections of facts D. Never true whereas a theory is sometimes true E. An educated guess whereas a theory has been tested successfully many times in many ways
E
The law of inertia states that an object A. Will continue moving at the same velocity unless an outside force acts on it. B. Will continue moving in a straight line unless a force acts on it. C. That is not moving will never move unless a force acts on it. D. At rest will remain at rest unless acted on by an outside force. E. Will do all of the above.
E
Which of the following statements is not true? A. Science is a method of answering theoretical questions. B. Technology is a method of solving practical problems. C. Technology may produce problems for society. D. Science and technology make up a large part of everyday lives. E. A good scientist is influenced by his or her likes and dislikes.
E
Which one of the following problems would NOT be a part of physics? A. Calculating the average density of a person B. Calculating the amount of energy a person uses while listening to a lecture C. Calculating the instantaneous velocity of an accelerating car D. Identifying all the forces acting on a person who is walking uphill E. Identifying all the bones in a human body
E
