Question 1

A physicist says that a car moving along a level road is being propelled by the road. Defend this statement.

Accepted Answer

It's True. The tires are made to rotate by the engine, and the tire surface is the only point of contact with the road. The turning tires push backward on the road. The tires can only push on the road if the road simultaneously pushes forward on the tires. This forward force is the only force that propels the car along the road. Air resistance occurs also, but this counteracts the propulsion by the road.

Question 2

A friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no wall, no tricks. You

Accepted Answer

A) agree that it can't be done. 
B) have reservations about this assertion. 
C) disagree, for a good punch easily delivers this much force. 
A) agree that it can't be done. 
B) have reservations about this assertion. 
C) disagree, for a good punch easily delivers this much force. A

Question 3

If you are learning to juggle it would be good to slow the ball's acceleration. You can do this by using

Accepted Answer

A) lighter balls. 
B) heavier balls. 
C) more balls. 
D) none of the above 
A) lighter balls. 
B) heavier balls. 
C) more balls. 
D) none of the above D

Question 4

A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension

Accepted Answer

A) increases. 
B) decreases. 
C) remains the same. 
A) increases. 
B) decreases. 
C) remains the same.

Question 5

How does the equilibrium rule, ΣF = 0, relate to Newton's first law of motion?

Accepted Answer

The equilibrium rule states Ne

Question 6

A karate chop breaks a board with a blow of 3000 N. The force that acts on the hand during this event is

Accepted Answer

A) less than 3000 N. 
B) 3000 N. 
C) more than 3000 N. 
D) not enough information 
A) less than 3000 N. 
B) 3000 N. 
C) more than 3000 N. 
D) not enough information

Question 7

When an object falls through the air, as velocity increases its acceleration

Accepted Answer

A) increases. 
B) decreases. 
C) remains the same whether in air or in a vacuum. 
A) increases. 
B) decreases. 
C) remains the same whether in air or in a vacuum.

Question 8

An object in motion tends to remain in motion

Accepted Answer

A) because of a force inside the object. 
B) only when an external force acts on it. 
C) without the need of a force. 
D) due to their nature. 
A) because of a force inside the object. 
B) only when an external force acts on it. 
C) without the need of a force. 
D) due to their nature.

Question 9

A player catches a ball. Consider the action force to the ball against the player's glove. The reaction is the

Accepted Answer

A) player's grip on the glove. 
B) force of the glove on the ball. 
C) friction of the ground against the player's shoes. 
D) muscular effort in the player's arms. 
E) none of the above 
A) player's grip on the glove. 
B) force of the glove on the ball. 
C) friction of the ground against the player's shoes. 
D) muscular effort in the player's arms. 
E) none of the above

Question 10

A space probe in remote outer space continues moving

Accepted Answer

A) because a force acts on it. 
B) in a curved path. 
C) even though no force acts on it. 
D) due to gravity. 
A) because a force acts on it. 
B) in a curved path. 
C) even though no force acts on it. 
D) due to gravity.

Question 11

If you are carrying a heavy bag of groceries and bang your hand against the wall, the concept that best explains why you are hurt is

Accepted Answer

A) inertia. 
B) gravity. 
C) acceleration. 
D) resistance. 
E) none of the above 
A) inertia. 
B) gravity. 
C) acceleration. 
D) resistance. 
E) none of the above

Question 12

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration is

Accepted Answer

A) 0 m/s2. 
B) 5 m/s2. 
C) 10 m/s2. 
D) infinite. 
E) none of the above 
A) 0 m/s2. 
B) 5 m/s2. 
C) 10 m/s2. 
D) infinite. 
E) none of the above

Question 13

If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in

Accepted Answer

A) a curved path. 
B) an outward spiral path. 
C) an inward spiral path. 
D) a straight-line path. 
A) a curved path. 
B) an outward spiral path. 
C) an inward spiral path. 
D) a straight-line path.

Question 14

A force of 1 N accelerates a 1-kg mass at 1 m/s2. The acceleration of a 2-kg mass acted upon by a force of 2 N is

Accepted Answer

A) half as much. 
B) twice as much. 
C) the same. 
D) none of the above 
A) half as much. 
B) twice as much. 
C) the same. 
D) none of the above

Question 15

While a car travels around a circular track at constant speed, its

Accepted Answer

A) acceleration is zero. 
B) velocity is zero. 
C) both 
D) none of the above 
A) acceleration is zero. 
B) velocity is zero. 
C) both 
D) none of the above

Question 16

The attraction of Earth on a skydiver pulls the diver downward. The reaction to this force is

Accepted Answer

A) air resistance the skydiver encounters while falling. 
B) Earth pulling upward on the skydiver. 
C) the attraction to the planets, stars, and every particle in the universe. 
D) all of the above 
E) none of the above 
A) air resistance the skydiver encounters while falling. 
B) Earth pulling upward on the skydiver. 
C) the attraction to the planets, stars, and every particle in the universe. 
D) all of the above 
E) none of the above

Question 17

A falling boulder experiences a force, which is responsible for its acceleration. What is the reaction to this force? How can this question be better phrased?

Accepted Answer

The force that acts on the boulder is Ea

Question 18

When dishes remain on a table when you yank the tablecloth beneath them, you're demonstrating

Accepted Answer

A) friction. 
B) inertia. 
C) constant motion. 
D) ΣF = 0. 
A) friction. 
B) inertia. 
C) constant motion. 
D) ΣF = 0.

Question 19

When a skydiver of mass 100 kg experiences air resistance of 400 N, her acceleration is

Accepted Answer

A) 0.2g. 
B) 0.4g. 
C) 0.5g. 
D) 0.6g. 
E) more than 0.6g. 
A) 0.2g. 
B) 0.4g. 
C) 0.5g. 
D) 0.6g. 
E) more than 0.6g.

Question 20

A 10-N block and a 1-N block lie on a horizontal frictionless table. To push them with equal acceleration, we would have to push with

Accepted Answer

A) equal forces on each block. 
B) 10 times as much force on the heavier block. 
C) 10 squared or 100 times as much force on the heavier block. 
D) one-tenth as much force on the heavier block. 
E) none of the above 
A) equal forces on each block. 
B) 10 times as much force on the heavier block. 
C) 10 squared or 100 times as much force on the heavier block. 
D) one-tenth as much force on the heavier block. 
E) none of the above

Exam 2: Newtons Laws of Motion

A physicist says that a car moving along a level road is being propelled by the road. Defend this statement.

A friend says that the heavyweight champion of the world cannot exert a force of 50 N on a piece of tissue paper with his best punch. The tissue paper is held in midair, no wall, no tricks. You

If you are learning to juggle it would be good to slow the ball's acceleration. You can do this by using

A heavy block at rest is suspended by a vertical rope. When the block is accelerated upward by the rope, the rope tension

How does the equilibrium rule, ΣF = 0, relate to Newton's first law of motion?

A karate chop breaks a board with a blow of 3000 N. The force that acts on the hand during this event is

When an object falls through the air, as velocity increases its acceleration

An object in motion tends to remain in motion

A player catches a ball. Consider the action force to the ball against the player's glove. The reaction is the

A space probe in remote outer space continues moving

If you are carrying a heavy bag of groceries and bang your hand against the wall, the concept that best explains why you are hurt is

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration is

If gravity between the Sun and Earth suddenly vanished, Earth would continue moving in

A force of 1 N accelerates a 1-kg mass at 1 m/s2. The acceleration of a 2-kg mass acted upon by a force of 2 N is

While a car travels around a circular track at constant speed, its

The attraction of Earth on a skydiver pulls the diver downward. The reaction to this force is

A falling boulder experiences a force, which is responsible for its acceleration. What is the reaction to this force? How can this question be better phrased?

When dishes remain on a table when you yank the tablecloth beneath them, you're demonstrating

When a skydiver of mass 100 kg experiences air resistance of 400 N, her acceleration is

A 10-N block and a 1-N block lie on a horizontal frictionless table. To push them with equal acceleration, we would have to push with

Patterns of Motion and Equilibrium

Momentum and Energy

Gravity, Projectiles, and Satellites

Fluid Mechanics

Thermal Energy and Thermodynamics

Heat Transfer and Change of Phase

Static and Current Electricity

Magnetism and Electromagnetic Induction

Waves and Sound

Light

Atoms and the Periodic Table

The Atomic Nucleus and Radioactivity

Elements of Chemistry

How Atoms Bond and Molecules Attract

Mixtures

How Chemicals React

Two Classes of Chemical Reactions

Organic Compounds

Rocks and Minerals

Plate Tectonics and Earths Interior

Shaping Earths Surface

Geologic Timereading the Rock Record

The Oceans, Atmosphere, and Climatic Effects

Driving Forces of Weather

The Solar System

Stars and Galaxies

The Structure of Space and Time

Prologue: the Nature of Science

Filters

A force of 1 N accelerates a 1-kg mass at 1 m/s². The acceleration of a 2-kg mass acted upon by a force of 2 N is