Physics 1, Module 1

In each second of fall, the distance a freely falling object will fall is A) about 5 m. B) about 10 m. C) the same, but not 5 m or 10 m. D) increasing. E) none of these

D

Science and technology are A) really one and the same. B) responsible for all the good in the world. C) responsible for all the bad in the world. D) fundamentally different from each other.

D

If your automobile runs out of fuel while you are driving, the engine stops but you do not come to an abrupt stop. The concept that most explains why is A) inertia. B) gravity. C) acceleration. D) resistance.

A

In science, an educated guess is a A) hypothesis. B) theory. C) both of these

A

Which of the following is a scientific statement? A) The moon is made of green cheese. B) There are things we will never know about. C) Matter is filled with undetectable particles. D) There are parts of the universe that will never be found by man. E) none of these

A

While an object near the Earth's surface is in free fall, its A) velocity increases. B) acceleration increases. C) mass increases. D) mass decreases.

A

An object at rest near the surface of a distant planet starts to fall freely. If the acceleration there is twice that of the Earth, its speed one second later would be A) 10 m/s. B) 20 m/s. C) 30 m/s. D) 40 m/s.

B

A bullet is dropped from the top of the Empire State Building while another bullet is fired downward from the same location. Neglecting air resistance, the acceleration of A) the fired bullet is greater. B) the dropped bullet is greater. C) each bullet is 9.8 meters per second per second.

C

Disregarding air resistance, objects fall with constant A) velocity. B) speed. C) acceleration. D) distances each successive second.

C

A truly educated person is knowledgeable about A) science. B) the arts. C) religion. D) all of these

D

According to Newton's law of inertia, a railroad train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains A) move too slowly. B) are much too heavy. C) must go up and down hills. D) always have forces that oppose their motion.

D

Starting from rest, the distance a freely falling object will fall in 0.5 second is about A) 1 m. B) 10 m. C) 1.00 m. D) none of the above

D

A ball is thrown upwards. Neglecting air resistance, what initial upward speed does the ball need to remain in the air for a total time of 10 seconds? A) about 50 m/s B) about 60 m/s C) about 80 m/s D) about 100 m/s E) about 110 m/s

A

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is A) zero. B) 10 km/hr. C) 110 km/hr. D) 1000 km/hr.

A

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is A) zero. B) equal to its weight. C) equal to its weight divided by its mass. D) equal to the product of its mass times its weight.

A

A pot falls from a ledge and hits the ground 45 m below. The speed with which it hits the ground is A) about 30 m/s. B) about 60 m/s. C) about 120 m/s. D) more than 120 m/s.

A

The scientist to first introduce the concept of inertia was A) Aristotle. B) Galileo. C) Newton. D) Copernicus.

A

A ball is thrown 125 meters upward and then falls the same distance back to Earth. Neglecting air resistance, its total time in the air is A) about 5 seconds. B) about 10 seconds. C) about 15 seconds. D) more than 20 seconds.

B

A ball is thrown upwards and caught when it comes back down. In the presence of air resistance, the speed with which it is caught is always A) more than the speed it had when thrown upwards. B) less than the speed it had when thrown upwards. C) the same as the speed it had when thrown upwards. D) impossible to determine.

B

The scientific method is most effective in A) making hypotheses. B) gaining, organizing, and applying new knowledge. C) discovering new things. D) making theories. E) performing experiments.

B

When a scientist is dishonest and reports false information, he or she A) like in so many other professions, will be excused by the scientific community. B) gets no second chance in the scientific community.

B

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to A) continue to follow a circular path. B) follow a straight-line path. C) increase its speed. D) revolve in a smaller circle.

B

A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is A) 30 N. B) 300 N. C) 3000 N. D) more than 3000 N.

C

The safest way for you to view the sun is with A) a telescope. B) binoculars. C) pinhole images. D) colored sunglasses.

C

Whereas Aristotle relied on logic in explaining nature, Galileo relied on A) logic also. B) patterns. C) experiment. D) mathematics.

C

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always A) in the direction of motion. B) opposite its velocity. C) directed upward. D) directed downward.

D

A car accelerates at 2 meters/s/s. Assuming the car starts from rest, how far will it travel in 10 s? A) 2 m B) 10 m C) 40 m D) 100 m E) 200 m

D

A car accelerates from rest for 5 seconds until it reaches a speed of 20 m/s. What is the car's acceleration in meters per second per second? A) 1 B) 2 C) 3 D) 4 E) 5

D

A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. Neglecting air resistance, two seconds later the rock's speed is A) zero. B) 4.9 m/s. C) 9.8 m/s. D) 14.7 m/s. E) none of the above

D

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that A) the milk carton has no acceleration. B) there is an action-reaction pair of forces. C) gravity tends to hold the milk carton secure. D) the milk carton has inertia. E) none of these

D

An object in mechanical equilibrium is an object A) at rest. B) moving with constant velocity. C) having no acceleration. D) all of these

D

At one instant an object in free fall is moving downward at 50 meters per second. One second later its speed should be about A) 25 m/s. B) 50 m/s. C) 55 m/s. D) 60 m/s. E) 100 m/s.

D

If a car accelerates from rest at 2 meters per second per second, its speed 3 seconds later will be about A) 2 m/s. B) 3 m/s. C) 4 m/s. D) 6 m/s.

D

While a car travels around a circular track at a constant speed, its A) acceleration is zero. B) velocity is zero. C) inertia is zero. D) none of the above

D

An object falls freely from rest on a planet where the acceleration due to gravity is 20 meters per second squared. After 5 seconds, the object will have a speed of A) 5 m/s. B) 10 m/s. C) 20 m/s. D) 50 m/s. E) 100 m/s.

E

Which of the following involves passion, talent, and intelligence? A) art B) literature C) music D) science E) all of these

E

A horse gallops a distance of 10 kilometers in a time of 30 minutes. Its average speed is A) 15 km/h. B) 20 km/h. C) 30 km/h. D) 40 km/h.

B

The synthesis of a large collection of information that contains well-tested and verified hypotheses about certain aspects of the world is known as a scientific A) fact. B) hypothesis. C) law or principle. D) theory. E) none of these

D

Twelve seconds after starting from rest, an object falling freely will have a speed of A) 10 m/s. B) 50 m/s. C) 100 m/s. D) more than 100 m/s.

D

A truck is moving at constant velocity. Inside the storage compartment, a rock is dropped from the midpoint of the ceiling and strikes the floor below. The rock hits the floor A) exactly below the midpoint of the ceiling. B) ahead of the midpoint of the ceiling. C) behind the midpoint of the ceiling. D) More information is needed to solve this problem. E) none of these

A

An object covers a distance of 8 meters in the first second of travel, another 8 meters during the next second, and 8 meters again during the third second. Its acceleration in meters per second per second is approximately A) 0. B) 5. C) 8. D) 24.

A

At one instant a heavy object in air is moving upward at 50 meters per second. One second later its speed is approximately A) 40 m/s. B) 50 m/s. C) 55 m/s. D) 60 m/s.

A

Eratosthenes learned about the position of the sun on June 22 by A) consulting library information. B) setting up a stick at Syene. C) setting up a stick at Alexandria. D) setting up sticks at both Syene and Alexandria. E) None of the above choices are correct.

A

Galileo's use of inclined planes allowed him to effectively A) slow down the acceleration of free fall. B) increase the acceleration beyond that of free fall. C) eliminate the acceleration of free fall. D) eliminate friction.

A

If a projectile is fired straight up at a speed of 10 m/s, the time it takes to reach the top of its path is about A) 1 second. B) 2 seconds. C) 10 seconds. D) not enough information to estimate

A

Of the sciences known as physics, chemistry, and biology, the most basic is A) physics. B) chemistry. C) biology. D) none in particular, as each may be considered fundamental.

A

Science, art, and religion do not contradict one another because A) all three have different domains. B) if you choose the right one, you can forget the other two. C) if you choose religion and art, you can forget about science. D) if you choose science, you can forget about religion and art.

A

The muzzle velocity of a bullet fired from a new rifle is 100 m/s. Neglecting air resistance, at the end of one second a bullet fired straight up into the air will have traveled a distance of A) (100 - 4.9) m. B) (100 + 4.9) m. C) 100 m. D) 4.9 m. E) none of these

A

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by about A) 5 m/s. B) 10 m/s. C) 15 m/s. D) a variable amount. E) depends on its initial speed

B

A ball is thrown upwards and returns to the same position. Compared with its original speed after release, its speed when it returns is about A) half as much. B) the same. C) twice as much. D) four times as much.

B

A bullet is fired straight down from the top of a high cliff. Neglecting air resistance, the acceleration of the bullet in meters per second per second A) is less than 9.8. B) is 9.8. C) is more than 9.8. D) depends on the height of the cliff.

B

A car accelerates at 2 meters per second per second. Assuming the car starts from rest, how much time does it need to accelerate to a speed of 30 m/s? A) 2 seconds B) 15 seconds C) 30 seconds D) 60 seconds E) none of these

B

A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. How far below the level from which it was thrown is the rock 2 seconds later? A) 4.9 m B) 9.8 m C) 14.7 m D) 19.6 m

B

A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. Neglecting air resistance, one second later the rock's speed is A) zero. B) 4.9 m/s. C) 9.8 m/s. D) 14.7 m/s. E) none of the above

B

A man weighing 800 N stands at rest on two bathroom scales so that his weight is distributed evenly over both scales. The reading on each scale is A) 200 N. B) 400 N. C) 800 N. D) none of these

B

A scientific hypothesis may turn out to be right or it may turn out to be wrong. If it is a valid hypothesis, there must be a test for proving it A) right. B) wrong.

B

An apple falls from a tree and hits the ground 5 meters below. It hits the ground with a speed of about A) 5 m/s. B) 10 m/s. C) 15 m/s. D) 20 m/s. E) not enough information given to estimate

B

Consider drops of water that leak at a steady rate from a dripping faucet. As the drops fall they A) get closer together. B) get farther apart. C) remain at a relatively fixed distance from one another.

B

Drop a rock from a 5-m height and it accelerates at 10 m/s2 and strikes the ground 1 s later. Drop the same rock from a height of 2.5 m and its acceleration of fall is about A) half as much. B) the same amount. C) twice as much. D) four times as much.

B

Galileo's interpretation of motion differed from Aristotle's in that Galileo emphasized A) the acceleration of free fall. B) time rates. C) the role of distance in describing motion. D) all of these E) none of these

B

If a car increases its velocity from zero to 60 km/h in 10 seconds, its acceleration is A) 3 km/h/s. B) 6 km/h/s. C) 10 km/h/s. D) 60 km/h/s. E) 600 km/h/s.

B

If a freely falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s/s, then its speed reading would increase each second by A) 10 m/s. B) 20 m/s. C) 30 m/s. D) 40 m/s. E) depends on its initial speed

B

If a projectile is fired straight up at a speed of 10 m/s, the total time to return to its starting position is about A) 1 second. B) 2 seconds. C) 10 seconds. D) 20 seconds. E) not enough information to estimate

B

If an object moves with constant acceleration, its velocity must A) be constant also. B) change by the same amount each second. C) change by varying amounts depending on its speed. D) always decrease.

B

If no external forces are acting on a moving object, it will A) continue moving at the same speed. B) continue moving at the same velocity. C) move slower and slower until it finally stops.

B

If you drop an object, it will accelerate downward at a rate of 9.8 meters per second per second. If you instead throw it downwards, its acceleration (in the absence of air resistance) will be A) less than 9.8 meters per second per second. B) 9.8 meters per second per second. C) greater than 9.8 meters per second per second.

B

In science, facts A) are absolute. B) may change. C) mean very little. D) are more important than theories.

B

The easiest way for you to measure the distance between the Earth and the moon is to place in your line of sight to the moon a A) magnifying glass. B) coin. C) telescope. D) meter stick.

B

The statement, "There are regions beneath the Earth's crust that will always be beyond the reach of scientific investigation," is a A) fact. B) speculation. C) hypothesis. D) scientific statement. E) theory.

B

When a rock thrown straight upwards gets to the exact top of its path, its A) velocity is zero and its acceleration is zero. B) velocity is zero and its acceleration is about 10 meters per second per second. C) velocity is about 10 m/s and its acceleration is zero. D) velocity is about 10 m/s and its acceleration is about 10 meters per second per second. E) none of these

B

A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water A) is greater for the dropped bullet. B) is greater for the fired bullet. C) is the same for each bullet. D) depends on how high they started. E) none of these

C

A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is A) zero. B) less than 30 m/s but larger than zero. C) about 30 m/s. D) more than 30 m/s. E) More information is needed for an estimate.

C

An object falls freely from rest on a planet where the acceleration due to gravity is twice as much as it is on Earth. In the first 5 seconds it falls a distance of A) 100 m. B) 150 m. C) 250 m. D) 500 m. E) none of these

C

Disregarding air drag, how fast must you toss a ball straight up in order for it to take 2 seconds to return to the level from which you tossed it? A) 5 m/s B) 7.5 m/s C) 10 m/s D) 15 m/s E) 20 m/s

C

Hang from a pair of gym rings and the upward support forces of the rings will always A) each be half your weight. B) each equal your weight. C) add up to equal your weight.

C

If a rocket initially at rest accelerates at a rate of 50 m/s2 for one minute, its speed will be A) 50 m/s. B) 500 m/s. C) 3000 m/s. D) 3600 m/s.

C

If an object falling freely were somehow equipped with an odometer to measure the distance it travels, then the amount of distance it travels each succeeding second would be A) constant. B) less and less each second. C) greater than the second before. D) doubled.

C

In science, a theory is A) an educated guess. B) less than a fact. C) a synthesis of a large body of well-tested knowledge. D) unchangeable.

C

It takes 6 seconds for a stone to fall to the bottom of a mine shaft. How deep is the shaft? A) about 60 m B) about 120 m C) about 180 m D) more than 200 m

C

One half second after starting from rest, a freely falling object will have a speed of about A) 20 m/s. B) 10 m/s. C) 5 m/s. D) 2.5 m/s. E) none of these

C

Someone standing at the edge of a cliff throws one ball straight up and another ball straight down at the same initial speed. Neglecting air resistance, the ball to hit the ground below the cliff with the greater speed will be A) the one thrown upward. B) the one thrown downward. C) neither -- they will both hit with the same speed.

C

Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration in meters per second per second? A) 0.25 B) 2.8 C) 4.0 D) 10 E) 40

C

The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is A) more than 10 N. B) less than 10 N. C) 10 N.

C

The two measurements necessary for calculating average speed are A) acceleration and time. B) velocity and time. C) distance and time. D) distance and acceleration. E) velocity and distance.

C

The vertical height attained by a basketball player who achieves a hang time of a full 1 s is A) about 0.8 m. B) about 1 m. C) about 1.2 m. D) about 2.5 m. E) more than 2.5 m.

C

When a rocket ship accelerating in outer space runs out of fuel, it A) accelerates for a short time, then slows down to a constant velocity. B) accelerates for a short time, slows down, and eventually stops. C) no longer accelerates.

C

When you stand at rest on a pair of bathroom scales, the readings on the scales will always A) each be half your weight. B) each equal your weight. C) add up to equal your weight.

C

Science is a body of knowledge that A) describes order in nature. B) is an ongoing activity of humans. C) condenses knowledge into testable laws. D) All of the above choices are correct. E) None of the above choices are correct.

D