Question 1

The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun

Accepted Answer

A) when momentum is conserved. 
B) because velocity is conserved. 
C) when both velocity and momentum are conserved. 
D) if the masses of the bullet and gun are equal. 
E) none of the above 
A) when momentum is conserved. 
B) because velocity is conserved. 
C) when both velocity and momentum are conserved. 
D) if the masses of the bullet and gun are equal. 
E) none of the above

Question 2

When bullets are fired in a forward direction from a fighter aircraft,the momentum of the aircraft

Accepted Answer

A) decreases. 
B) is unchanged. 
C) increases. 
A) decreases. 
B) is unchanged. 
C) increases.

Question 3

While driving down the highway a lovebug spatters onto your windshield.Which experiences the greater force of impact?

Accepted Answer

A) the lovebug 
B) your car 
C) both the same but with different consequences 
A) the lovebug 
B) your car 
C) both the same but with different consequences

Question 4

When wind encounters a wind turbine that produces energy,wind speed on the downside of the blades is

Accepted Answer

A) slowed. 
B) speeded up. 
C) not affected. 
A) slowed. 
B) speeded up. 
C) not affected.

Question 5

When Danny Diver who weighs 500 N steps off a diving board 10 m above the water,he hits the water with kinetic energy of

Accepted Answer

A) 10 J. 
B) 500 J. 
C) 510 J. 
D) 5000 J. 
E) more than 5000 J. 
A) 10 J. 
B) 500 J. 
C) 510 J. 
D) 5000 J. 
E) more than 5000 J.

Question 6

When you jump from an elevated position you usually bend your knees upon reaching the ground.By doing this,the contact time is about 10 times more than for a stiff-legged landing and the average force your body experiences is reduced by

Accepted Answer

A) less than 10 times. 
B) more than 10 times. 
C) about 10 times. 
A) less than 10 times. 
B) more than 10 times. 
C) about 10 times.

Question 7

Lifting a 100-N load with 50 N of force lifts it

Accepted Answer

A) half as high. 
B) as high. 
C) twice as high. 
A) half as high. 
B) as high. 
C) twice as high.

Question 8

When Peter tosses an egg against a sagging sheet,the egg doesn't break due to

Accepted Answer

A) reduced impulse. 
B) reduced momentum. 
C) both of these 
D) neither of these 
A) reduced impulse. 
B) reduced momentum. 
C) both of these 
D) neither of these

Question 9

A freight train rolls along a track with considerable momentum.If it rolls at the same speed but has twice as much mass,its momentum is

Accepted Answer

A) zero. 
B) doubled. 
C) quadrupled. 
D) unchanged. 
A) zero. 
B) doubled. 
C) quadrupled. 
D) unchanged.

Question 10

A simple machine cannot multiply

Accepted Answer

A) force. 
B) distance. 
C) energy. 
D) none of the above 
A) force. 
B) distance. 
C) energy. 
D) none of the above

Question 11

The distinction between impulse and force involves the

Accepted Answer

A) distance the force acts. 
B) time the force acts. 
C) difference between acceleration and velocity. 
D) mass and its effect on resisting a change in momentum. 
A) distance the force acts. 
B) time the force acts. 
C) difference between acceleration and velocity. 
D) mass and its effect on resisting a change in momentum.

Question 12

What is the speed of a 6-kg ball with a momentum of 72 kg∙m/s?

Accepted Answer

A) 3 m/s 
B) 4 m/s 
C) 12 m/s 
D) 48 m/s 
E) none of the above 
A) 3 m/s 
B) 4 m/s 
C) 12 m/s 
D) 48 m/s 
E) none of the above

Question 13

A pulley has two supporting strands.To lift a load 1 meter means you will have to pull a distance of

Accepted Answer

A) 1/2 m. 
B) 1 m. 
C) 2 m. 
D) more than 2 m. 
A) 1/2 m. 
B) 1 m. 
C) 2 m. 
D) more than 2 m.

Question 14

You do work on a cart loaded with groceries.If you do this work in one-third the usual time,you expend

Accepted Answer

A) one third as much power. 
B) the usual power. 
C) three times the usual power. 
D) need more information. 
A) one third as much power. 
B) the usual power. 
C) three times the usual power. 
D) need more information.

Question 15

The conservation of momentum is most closely related to Newton's

Accepted Answer

A) first law. 
B) second law. 
C) third law. 
A) first law. 
B) second law. 
C) third law.

Question 16

When Jean standing on slippery ice catches her leaping dog Daisy,the momentum of both Jean and Daisy after the catch is

Accepted Answer

A) greater than their combined momentum before the catch. 
B) equal to their combined momentum before the catch. 
C) somewhat less than their combined momentum before the catch. 
A) greater than their combined momentum before the catch. 
B) equal to their combined momentum before the catch. 
C) somewhat less than their combined momentum before the catch.

Question 17

When a boxer is moving away from a punch,the force experienced is reduced because

Accepted Answer

A) momentum transfer is reduced. 
B) the time of contact is increased. 
C) the force is less effective. 
D) all of the above 
A) momentum transfer is reduced. 
B) the time of contact is increased. 
C) the force is less effective. 
D) all of the above

Question 18

Hydrogen,like electricity,is

Accepted Answer

A) an energy source. 
B) not an energy source. 
C) a source of both thermal and electric power. 
A) an energy source. 
B) not an energy source. 
C) a source of both thermal and electric power.

Question 19

A piece of taffy slams into and sticks to another identical piece of taffy 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 20

The massive ram of a pile driver falling from rest strikes a pile with a speed that depends on the

Accepted Answer

A) initial height of the ram. 
B) initial potential energy of the ram. 
C) distance the ram falls. 
D) all of the above 
A) initial height of the ram. 
B) initial potential energy of the ram. 
C) distance the ram falls. 
D) all of the above

Exam 3: Momentum and Energy

The speed of a bullet fired from a gun will be about the same as the speed of the recoiling gun

When bullets are fired in a forward direction from a fighter aircraft,the momentum of the aircraft

While driving down the highway a lovebug spatters onto your windshield.Which experiences the greater force of impact?

When wind encounters a wind turbine that produces energy,wind speed on the downside of the blades is

When Danny Diver who weighs 500 N steps off a diving board 10 m above the water,he hits the water with kinetic energy of

When you jump from an elevated position you usually bend your knees upon reaching the ground.By doing this,the contact time is about 10 times more than for a stiff-legged landing and the average force your body experiences is reduced by

Lifting a 100-N load with 50 N of force lifts it

When Peter tosses an egg against a sagging sheet,the egg doesn't break due to

A freight train rolls along a track with considerable momentum.If it rolls at the same speed but has twice as much mass,its momentum is

A simple machine cannot multiply

The distinction between impulse and force involves the

What is the speed of a 6-kg ball with a momentum of 72 kg∙m/s?

A pulley has two supporting strands.To lift a load 1 meter means you will have to pull a distance of

You do work on a cart loaded with groceries.If you do this work in one-third the usual time,you expend

The conservation of momentum is most closely related to Newton's

When Jean standing on slippery ice catches her leaping dog Daisy,the momentum of both Jean and Daisy after the catch is

When a boxer is moving away from a punch,the force experienced is reduced because

Hydrogen,like electricity,is

The massive ram of a pile driver falling from rest strikes a pile with a speed that depends on the

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 Time - Reading 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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