Physics Test 1
You are swinging a tin can around your head in a perfectly horizontal circle and its acceleration is 32 m/s2. If its speed is 4 m/s what is the value of the radius of its circular path? 4 m 8 m 2 m 0.5 m
0.5 m
How many significant figures are in the number 0.0035?
2
Which of the following numbers is the largest?
2.05 x 10^4
How many significant figures are in the number 1.005?
4
A net force of 8 N is applied to a 2 kg object. The object's acceleration is 4 m/s2 2 m/s2 8 m/s2 16 m/s2
4 m/s2
Which of the following is the correct scientific notation representation of the number 0.000572?
5.72 x 10^-4
To cause a 25 kg object to experience an acceleration of 2 m/s2 the net force that needs to be applied to the object is 10 N 5 N 50 N 100 N
50 N
Assuming you have two vectors A and B which of the following is A + B (see the attached image)? A B C None of the above
A
If A = (3 m, 4 m) and B = (7 m, 1 m), find A - B. A - B = (-4 m, 3 m) A - B = (4 m, -3 m) A - B = (10 m, 5 m) A - B = (-10 m, - 5 m)
A - B = (-4 m, 3 m)
If A = (3 m, 4 m) and B = (7 m, 1 m), find A + B. A + B = (11 m, 4 m) A + B = (10 m, 5 m) A + B = (21 m, 4 m) A + B = (5 m, 10 m)
A+B = (10 m, 5 m)
Drag forces are applicable to objects moving through which type of material? A. air B. water C. honey D. All of the above E. None of the above
All of the above
Which of the following devices on a car can be used to cause the car to accelerate? A. The gas pedal B. The brake pedal C. The steering wheel D. All of the above
All of the above
Which of the following is the definition of a theory? A. a representation of something that is often too difficult (or impossible) to display directly B. an explanation for patterns in nature that is supported by scientific evidence and verified multiple times by various groups of researchers C. concise language to describe a generalized pattern in nature that is supported by scientific evidence and repeated experiments D. All of the above E. None of the above
An explanation for patterns in nature that is supported by scientific evidence and verified multiple times by various groups of researchers
You go through a loop in a roller coaster at constant speed. Where is your apparent weight a minimum? A. At the top B. Halfway up, going up C. At the bottom D. Halfway up, going down
At the top
Suppose you go from the earth to a planet where the acceleration of gravity is 2.5 m/s2. On the new planet your weight will be about A. quadruple B. be ¼ its value on Earth C. the same as on earth D. double
Be 1/4 its value on Earth
A child throws a ball perfectly horizontally at the same time a dirt clod falls off it at the same height above the ground. The clod falls vertically downward. Ignoring air resistance, the time when the clod hits the ground will A. not depend upon how high it started falling from B. be equal to the time the ball hits the ground C. be earlier than when the ball hits D. be later than when the ball hits
Be equal to the time the ball hits the ground
Assuming you have two vectors A and B which of the following is A - B (see the attached image)? A B C None of the above
C
Given the vector R which of the following vectors is equal in magnitude but opposite in direction (see the attached image)? A B C None of these
C
You are on an airplane waiting to take off for a summer trip. Having just come from your physics final, you decide to measure the acceleration of the plane during takeoff by tying your graphing calculator to a string and suspending it. Your new device will do a great job of measuring the plane's constant acceleration during takeoff because, as the plane accelerates your calculator will A. rotate around in a circle. B. swing forward and stay there. C. swing backward and stay there. D. swing backward at a steady rate.
C. swing backward and stay there
Suppose you are a football player and you kick a ball for a field goal. Including air resistance, the ball's horizontal velocity A. increases throughout the path B. changes throughout the path due to gravitational acceleration C. decreases throughout the path D. is zero at the top of the path
Decreases throughout the path
You are playing with your younger cousins and find yourself on all fours, with your hands and feet on four bathroom scales on the level ground. You took a "Physics in Everyday Life" course so you can make a reasonable guess that the reading on each scale is obtained by A. dividing your weight by 4. B. dividing your weight by 2. C. dividing your mass by 4. D. your mass.
Dividing your weight by 4
Assume you have an object moving through a fluid at a certain velocity of 4 m/s. If the velocity of the object increased to 8 m/s what would be the effect on the drag force on the object? A. Drag would be cut in half B. Drag would stay the same C. Drag would be doubled D. Drag would be quadrupled
Drag would be quadrupled
Accuracy and precision have the exact same definition.
False
Aerospace engineers do not need to consider drag when designing an airplane.
False
An attosecond is longer than a exasecond.
False
Currently, there are five basic forces that are known.
False
Deceleration and negative acceleration always have the exact same meaning.
False
Drawing a free-body diagram is always the last step when you are solving a problem involving forces.
False
Graphical methods of vector addition and subtraction are more accurate than analytical methods of vector addition and subtraction.
False
Hooke's law is only always obeyed when a material is undergoes deformation.
False
Ignoring air resistance and assuming a fixed initial speed, the maximum horizontal range a projectile can travel is when the angle of the projectile is at 35 degrees relative to the ground.
False
Isaac Newton discovered what we know today as modern physics.
False
Kinetic and static friction refer to the same exact force.
False
Mass and weight have the exact same definition.
False
No matter your location in the universe your weight never changes.
False
Physicists rarely approximate anything when solving problems.
False
Physics is irrelevant to the medical disciplines.
False
Physics is only concerned with the fundamental mechanisms of microscale phenomena.
False
Speed and velocity mean the exact same thing.
False
The SI units for velocity are cm/s.
False
The density of a fluid does not affect the drag of an object moving through the fluid.
False
When a positive scalar is multiplied by a vector, the direction changes.
False
Wind never affects the total velocity of an airplane during flight.
False
Stokes law is only applicable to large objects moving slow
Fasle
When you ride a bike on a flat road you must keep pedaling in order to keep a constant speed. Why can you not simply coast at a constant speed? A. The wheels are not large enough resulting in a rotational inertia that is too small to maintain a constant speed B. The curvature of the Earth results in the road being not entirely level so you are always pedalling uphill C. The gear ratio between the front gear and the back gear is not properly adjusted D. Friction between the various moving parts in your bike, and between your tires and the road, cause your work to be lost to thermal energy
Friction between the various moving parts in your bike, and between your tires and the road, cause your work to be lost to thermal energy
Your apparent weight is equal to your weight A. In an elevator in free fall. B. In an elevator accelerating downwards. C. In an elevator not accelerating. D. In an elevator accelerating upwards.
In an elevator not accelerating
Suppose a tree branch falls down to the ground with constant acceleration and takes 2 seconds to hit the ground. Which of the following statements regarding the path of the branch is true? A. It covers the same distance during the first second as it does during the last second. B. It covers less distance during the last second. C. Its acceleration is increasing during the time it falls D. It covers more distance during the last second.
It covers more distant during the last second
Suppose you have a car traveling down the road at constant speed and not changing direction. It is experiencing gravity, wind resistance and frictional forces from the road. What can be said about the car's acceleration? A. It is not accelerating because gravity holds it down. B. It is not accelerating because it has constant velocity. C. It is accelerating because there are forces acting on it. D. It accelerating because the motor is running, propelling the car forward.
It is not accelerating because it has constant velocity
Assume you are pushing a 5 kg box across a flat floor. If somebody where to place a 5 kg object on top of the box while you where pushing what would happen to the magnitude of the frictional force? A. It would be quarted B. It would be halved C. It would be doubled D. It would stay the same
It would be doubled
Which of the following is the fundamental unit of mass? Meter (m) Kilogram (kg) Second (s) Ampere (A)
Kilogram
Suppose you are standing on a bathroom scale when you are flying in a jet airplane. For a moment the scale reads less than your actual weight. During that moment, it's exerting an upward force on you that is A. greater than your weight B. equal to zero C. less than your weight. D. equal to your weight.
Less than your weight
Which of the following is the SI unit of length? Meter (m) Kilogram (kg) Second (s) Ampere (A)
Meter
The units for stress are N/m N/m2 N N·m2 None of the above
N/m2
The units for strain are N·m2 N/m N/m2 N None of the above
None of the above
Which of the following is not a valid unit of angle measurement? A. Radians B. Degrees C. Revolutions D. None of the above
None of the above
Suppose you go from the earth to a planet where the acceleration of gravity is 3 m/s2. On the new planet your mass will A. be 9 times its value on Earth B. not change C. be 1/3 its value on Earth D. be 3/10 its value on Earth
Not change
Neglecting air resistance what is the general shape of a projectile's trajectory (assume there is some horizontal motion)? A. Parabola B. Hyperbola C. Semicircle D. Straight
Parabola
Suppose you are a football player and you kick a ball for a field goal. Ignoring air resistance, the ball's horizontal velocity A. is zero at the top of the path B. remains constant throughout the path C. is maximum at the top of the path D. changes throughout the path due to gravitational acceleration
Remains constant throughout the path
Which of the following is the fundamental unit of time? Meter (m) Kilogram (kg) Second (s) Ampere (A)
Second
Which of the following interaction has the lowest coefficient of static friction? A. Shoes on ice B. Metal on wood C. Shoes on wood D. Rubber on dry concrete
Shoes on ice
Suppose you are driving north and suddenly hit your brakes to avoid a dog in the road. As you come to a stop your acceleration is directed A. South B. Downwards C. Nowhere because acceleration is a scalar D. North
South
Imagine you have a large book resting on a table. If you wanted to push the book from one side to the other what force would have have to overcome in order to start moving it? A. Kinetic Friction Force B. Static Friction Force C. Drag Force D. None of the above
Static Friction Force
A classroom demo that is popular with students and unpopular with custodians is to fill a Styrofoam cup with water, poke a hole in the bottom and then drop the cup into a garbage can waiting below. On the way down, the leak will A. increase because gravity pulls on the water more than it does the cup. B. increase because the cup is accelerating. C. stop because the cup and water are both in free fall and locally weightless. D. stop because the cup doesn't experience gravity
Stop because the cup and water are both in free fall locally weightless
Young's modulus is a material property that represents a linear relationship between which of the following: A. Force, displacement B. Stress, strain C. Force, strain D. Stress, displacement
Stress, strain
When you drop a rubber ball on the floor and it bounces, the direction of its velocity reverses because A. the floor exerts an upward support force on the ball and this force stops the ball's descent and eventually propels it upward. B. the ball's momentum is conserved. C. the ball can't stop moving and the floor blocks its path. D. the ball's energy is conserved.
The floor exerts an upward support force on the ball and this force stops the ball's descent and eventually propels it upward
Suppose you have two cars, and the larger one is twice as massive as the smaller one. If you and a friend push on them so that their accelerations are equal, how must the forces applied to the cars compare? A. The force on the larger car is more than three times that on the smaller car. B. The force on the larger car is equal to that on the smaller car C. The force on the larger car is twice that on the smaller car. D. The force on the larger car is ½ that on the smaller car.
The force on the larger car is twice that on the smaller car
Suppose an object is traveling at terminal velocity, so it is falling through air but not accelerating. How does the force of air resistance compare to its weight? A. The two forces are equal and opposite. B. The two forces are equal. C. Air resistance is greater than the ball's weight. D. Air resistance is less than the ball's weight.
The two forces are equal and opposite
Some engineers have suggested that we can simulate gravity in outer space by having a circular rotating space station where persons feel an outward - directed fictitious force due to the rotation of the station. The reason they feel such a force is because A. their velocity is away from the center of the space station and their inertia tends to make them move in towards the center. B. the fictitious force is always in the direction of centripetal acceleration. C. their velocity is toward the center of the space station and their inertia tends to keep them moving outward. D. they are accelerating toward the center of the space station and inertia tends to keep them moving sideways.
They are accelerating toward the center of the space station and inertia tends to keep them moving sideways
You are riding an amusement park ride where you are strapped to the inside of a giant metal wheel that is rotating quite rapidly. Your acceleration is A. Toward the center B. Straight down C. Zero D. Straight up
Toward the center
A centimeter is larger than a millimeter.
True
A kilogram of cotton balls has the same amount of mass as a kilogram of lead.
True
A net external force on an object by definition produces a change in velocity.
True
A vector quantity like velocity has both a magnitude and direction.
True
Acceleration can be defined as the change in velocity with respect to time.
True
According to Newton's third law of motion forces always occur in pairs.
True
Assuming one-dimensional motion, a constant positive acceleration produces a linear increase in velocity.
True
Automotive engineers should consider the effects of drag when designing the shape of a new vehicle.
True
Depending on your reference frame the measured velocity of an object can be different.
True
If the normal force between two objects is increased, the frictional force will be increased.
True
In 2D kinematics, the two perpendicular vector components of motion are independent of one another.
True
In the absence of air resistance when you drop a falling ball its speed will steadily increase until it hits the ground.
True
Kinetic friction causes surfaces in contact to increase in temperature.
True
Newton's second law can be concisely represented by the following equation: Fnet = ma
True
Physics is concerned with describing the interactions of energy, matter, space, and time, and it is especially interested in what fundamental mechanisms underlie every phenomenon.
True
Science consists of the theories and laws that are the general truths of nature as well as the body of knowledge they encompass.
True
The Pythagorean theorem is used in 2D kinematics.
True
The SI units of force are measured in Newtons.
True
The inertia of an object is measured by its mass.
True
The presence of water on the road decreases the static friction between the tires and the road.
True
The tip to tail method only works with two vectors that are added together.
True
When a free falling object reaches terminal velocity, the net force on the object equals 0.
True
When considering real air resistance, a projectile's horizontal motion is reduced throughout flight.
True
You are flying on an airplane and you notice that a ball of aluminum foil from lunch starts to roll to the left. From the motion of the foil ball you can conclude that the plane is A. moving at constant velocity toward the right. B. moving at constant velocity toward the left. C. turning toward the right. D. turning toward the left.
Turning toward the right
Your weight and mass are different in that A. your weight depends upon local gravity but your mass does not. B. being weightless means that you have to lose mass. C. your weight is measured in kg but not your mass D. your mass depends upon local gravity but your weight does not.
Your weight depends upon local gravity but your mass does not
Which of the following is the definition of a Law? A. a representation of something that is often too difficult (or impossible) to display directly B. an explanation for patterns in nature that is supported by scientific evidence and verified multiple times by various groups of researchers C. concise language to describe a generalized pattern in nature that is supported by scientific evidence and repeated experiments D. All of the above E. None of the above
concise language to describe a generalized patter in nature that is supported by scientific evidence and repeated experiments
The first step in solving one-dimensional kinematics problems is to find the relevant equations for the problem.
false
If you are backing up but slowing down, your acceleration is directed A. backwards B. to the left C. forwards D. nowhere
forwards
A projectile is thrown directly upward and caught again. At the top of its path A. its vertical velocity is zero B. its horizontal velocity changes C. it stops accelerating D. its acceleration changes
its vertical velocity is zero
The SI units of acceleration are A. m/s B. kg m/s2 C. kg m2/s2 D. m/s2
m/s^2
The acceleration of an object is equal to A. the time an object has been in motion B. the rate of change of its speed only C. the rate of change of its velocity D. the rate of change of its position
the rate of change of its velocity
