Question 1

In terms of momentum, why is a drinking glass less likely to break if it falls on a carpet floor than falling on a hard concrete floor?

Accepted Answer

The carpet floor has more "give," which

Question 2

A piece of taffy slams into and sticks to another identical piece of taffy that is at rest. The momentum of the two pieces of taffy stuck together after the collision is the same as it was before the collision. Kinetic energy is a different story, for part of it turns into heat. What percentage of the kinetic energy converts into heat?

Accepted Answer

A) 0% 
B) 25% 
C) 50% 
D) 75% 
E) not enough information 
A) 0% 
B) 25% 
C) 50% 
D) 75% 
E) not enough information

Question 3

Compared with falling on a wooden floor, a wine glass may not break when it falls on a carpeted floor because of

Accepted Answer

A) lesser impulse in stopping. 
B) longer time to stop. 
C) both 
D) neither 
A) lesser impulse in stopping. 
B) longer time to stop. 
C) both 
D) neither

Question 4

The power expended for a barbell raised 2.0 m in 2 s is

Accepted Answer

A) 1 W. 
B) 4 W. 
C) 8 W. 
D) not enough information 
A) 1 W. 
B) 4 W. 
C) 8 W. 
D) not enough information

Question 5

A clerk can lift containers a vertical distance of 1 m, or roll them up a 2-m-long ramp to the same elevation. With the ramp, the applied force needed is

Accepted Answer

A) half as much. 
B) twice as much. 
C) the same. 
A) half as much. 
B) twice as much. 
C) the same.

Question 6

Compared to a recoiling rifle, the bullet that is fired has a greater

Accepted Answer

A) momentum. 
B) kinetic energy. 
C) none of the above 
A) momentum. 
B) kinetic energy. 
C) none of the above

Question 7

Padded dashboards in cars are safer in an accident than non-padded ones because an occupant hitting the dash has

Accepted Answer

A) increased time of contact. 
B) decreased contact force. 
C) both 
D) neither of these 
A) increased time of contact. 
B) decreased contact force. 
C) both 
D) neither of these

Question 8

A machine puts out 100 W of power for every 1000 W put into it. The efficiency of the machine is

Accepted Answer

A) 10%. 
B) 50%. 
C) 90%. 
D) 110%. 
E) none of the above 
A) 10%. 
B) 50%. 
C) 90%. 
D) 110%. 
E) none of the above

Question 9

A popular swinging-balls apparatus (Newton's cradle)consists of a series of identical elastic balls suspended by strings so they barely touch each other. When two balls are pulled away from one end and released, they strike the row of balls and two balls pop out from the other end. If instead, one ball popped out with twice the speed, this would be a violation of conservation of

Accepted Answer

A) momentum. 
B) energy. 
C) both 
D) none of the above 
A) momentum. 
B) energy. 
C) both 
D) none of the above

Question 10

A boy fires a spring-loaded Ping-Pong ball gun. Briefly compare the forces and impulses on the gun and the ball. Which has more momentum? Which moves faster?

Accepted Answer

Both force and impulse on both the ball

Question 11

From the same height you simultaneously drop a lightweight tennis ball and a heavyweight bowling ball. When they hit the floor they have the same

Accepted Answer

A) speed. 
B) force. 
C) momentum. 
D) all of the above 
E) none of the above 
A) speed. 
B) force. 
C) momentum. 
D) all of the above 
E) none of the above

Question 12

The impulse-momentum relationship is a direct result of

Accepted Answer

A) Newton's first law. 
B) Newton's second law. 
C) Newton's third law. 
A) Newton's first law. 
B) Newton's second law. 
C) Newton's third law.

Question 13

A moving object has

Accepted Answer

A) speed. 
B) velocity. 
C) momentum. 
D) energy. 
E) all of the above 
A) speed. 
B) velocity. 
C) momentum. 
D) energy. 
E) all of the above

Question 14

An open freight car rolls friction-free along a horizontal track in vertically pouring rain. As water accumulates in the car, its speed

Accepted Answer

A) increases. 
B) decreases. 
C) doesn't change. 
A) increases. 
B) decreases. 
C) doesn't change.

Question 15

A golf ball is thrown at and bounces backward from a massive bowling ball that is initially at rest. After the collision, compared to the golf ball, the bowling ball has more

Accepted Answer

A) momentum, but less kinetic energy. 
B) kinetic energy, but less momentum. 
C) momentum and more kinetic energy. 
D) less momentum and less kinetic energy. 
E) not enough information 
A) momentum, but less kinetic energy. 
B) kinetic energy, but less momentum. 
C) momentum and more kinetic energy. 
D) less momentum and less kinetic energy. 
E) not enough information

Question 16

You're driving down the highway and a lovebug spatters onto your windshield. Which undergoes the greater change in momentum?

Accepted Answer

A) the lovebug 
B) your car 
C) both the same 
A) the lovebug 
B) your car 
C) both the same

Question 17

Whereas impulse involves the time that a force acts, work involves the

Accepted Answer

A) distance that a force acts. 
B) time and distance that a force acts. 
C) acceleration that a force produces. 
A) distance that a force acts. 
B) time and distance that a force acts. 
C) acceleration that a force produces.

Question 18

You use a straw for a pea shooter. The speed of the pea emerging from the straw when you blow through it will be greater if the straw is

Accepted Answer

A) cut in half. 
B) full length. 
C) either cut in half or full length. 
A) cut in half. 
B) full length. 
C) either cut in half or full length.

Question 19

Two identical gliders slide toward each other on an air track. One glider moves at 1 m/s and the other glider moves at 2 m/s. They collide and stick. The combined gliders move at

Accepted Answer

A) 1/2 m/s. 
B) 1/3 m/s. 
C) 1/6 m/s. 
D) 3/4 m/s. 
E) 1.5 m/s. 
A) 1/2 m/s. 
B) 1/3 m/s. 
C) 1/6 m/s. 
D) 3/4 m/s. 
E) 1.5 m/s.

Question 20

No work is done by gravity on a bowling ball that rolls along a bowling alley because

Accepted Answer

A) no force acts on the ball. 
B) no distance is covered by the ball. 
C) the force on the ball is at right angles to the ball's motion. 
D) no potential energy converts to kinetic energy. 
E) its kinetic energy may vary. 
A) no force acts on the ball. 
B) no distance is covered by the ball. 
C) the force on the ball is at right angles to the ball's motion. 
D) no potential energy converts to kinetic energy. 
E) its kinetic energy may vary.

Exam 3: Momentum and Energy

In terms of momentum, why is a drinking glass less likely to break if it falls on a carpet floor than falling on a hard concrete floor?

Compared with falling on a wooden floor, a wine glass may not break when it falls on a carpeted floor because of

The power expended for a barbell raised 2.0 m in 2 s is

A clerk can lift containers a vertical distance of 1 m, or roll them up a 2-m-long ramp to the same elevation. With the ramp, the applied force needed is

Compared to a recoiling rifle, the bullet that is fired has a greater

Padded dashboards in cars are safer in an accident than non-padded ones because an occupant hitting the dash has

A machine puts out 100 W of power for every 1000 W put into it. The efficiency of the machine is

A boy fires a spring-loaded Ping-Pong ball gun. Briefly compare the forces and impulses on the gun and the ball. Which has more momentum? Which moves faster?

From the same height you simultaneously drop a lightweight tennis ball and a heavyweight bowling ball. When they hit the floor they have the same

The impulse-momentum relationship is a direct result of

A moving object has

An open freight car rolls friction-free along a horizontal track in vertically pouring rain. As water accumulates in the car, its speed

A golf ball is thrown at and bounces backward from a massive bowling ball that is initially at rest. After the collision, compared to the golf ball, the bowling ball has more

You're driving down the highway and a lovebug spatters onto your windshield. Which undergoes the greater change in momentum?

Whereas impulse involves the time that a force acts, work involves the

You use a straw for a pea shooter. The speed of the pea emerging from the straw when you blow through it will be greater if the straw is

Two identical gliders slide toward each other on an air track. One glider moves at 1 m/s and the other glider moves at 2 m/s. They collide and stick. The combined gliders move at

No work is done by gravity on a bowling ball that rolls along a bowling alley because

Patterns of Motion and Equilibrium

Newtons Laws of Motion

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

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