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Physics Chapters 4-8

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 

Galileo found that a ball rolling down one inclined plane would roll how far up another inclined plane?
a.
The ball would not roll up the other plane at all.
b.
To nearly its original height
c.
To about one quarter its original height
d.
To nearly twice its original height
e.
To nearly half its original height
 

 2. 

The law of inertia states that an object
a.
will continue moving at the same velocity unless an outside force acts on it.
b.
will continue moving in a straight line unless an outside force acts on it.
c.
that is not moving will never move unless a force acts on it.
d.
at rest will remain at rest unless acted on by an outside force.
e.
will do all of the above.
 

 3. 

The law of inertia applies to
a.
objects at rest.
b.
moving objects.
c.
both moving and nonmoving objects.
 

 4. 

If the force of gravity suddenly stopped acting on the planets, they would
a.
spiral slowly towards the sun.
b.
continue to orbit the sun.
c.
move in straight lines tangent to their orbits.
d.
spiral slowly away from the sun.
e.
fly straight away from the sun.
 

 5. 

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. The reason this can be done is that
a.
gravity pulls very hard on the milk carton.
b.
the milk carton has very little weight.
c.
the milk carton has inertia.
d.
none of the above
 

 6. 

The mass of a sheep that weighs 110 N is about
a.
1 kg.
b.
11 kg.
c.
110 kg.
d.
1100 kg.
e.
none of the above
 

 7. 

The force required to maintain an object at a constant speed in free space is equal to
a.
the mass of the object.
b.
the weight of the object.
c.
zero.
d.
the force required to stop it.
e.
none of the above
 

 8. 

An object following a straight-line path at constant speed
a.
has no forces acting on it.
b.
has a net force acting on it in the direction of motion.
c.
has zero acceleration.
d.
must be moving in a vacuum.
e.
none of the above
 

 9. 

Friction
a.
comes from microscopic bumps that act as obstructions to the object's motion.
b.
is the name given to the force acting between surfaces sliding past one another.
c.
acts in a direction that opposes the motion of an object.
d.
all of the above
e.
none of the above
 

 10. 

A 15-N force and a 45-N force act on an object in opposite directions. What is the net force on the object?
a.
15 N
b.
30 N
c.
45 N
d.
60 N
e.
none of the above
 

 11. 

Equilibrium occurs when
a.
all the forces acting on an object are balanced.
b.
the sum of the +x forces on an object equals the sum of the –x forces.
c.
the net force on the object is zero.
d.
the sum of the upward forces equals the sum of the downward forces.
e.
all of the above
 

 12. 

Friction is a force that always acts
a.
perpendicular to an object's motion.
b.
opposite to an object's motion.
c.
in the same direction as an object's motion.
 

 13. 

What is the maximum resultant possible when adding a 2-N force to an 8-N force?
a.
2 N
b.
6 N
c.
8 N
d.
10 N
e.
16 N
 

 14. 

How much does a 3.0-kg bag of bolts weigh?
a.
7.2 N
b.
14.4 N
c.
22.8 N
d.
29.4 N
e.
58.8 N
 

 15. 

What is the minimum resultant possible when adding a 5-N force to an 8-N force?
a.
5 N
b.
3 N
c.
8 N
d.
13 N
e.
40 N
 

 16. 

Accelerations are produced by
a.
forces.
b.
velocities.
c.
accelerations.
d.
masses.
e.
none of the above
 

 17. 

How does acceleration of an object change in relation to its mass? It is
a.
directly proportional.
b.
Acceleration doesn't depend on mass at all.
c.
inversely proportional.
 

 18. 

The acceleration produced by a net force on an object is
a.
inversely proportional to the mass of the object.
b.
directly proportional to the magnitude of the net force.
c.
in the same direction as the net force.
d.
all of the above
e.
none of the above
 

 19. 

When an object reaches terminal velocity its acceleration is
a.
0 m/s2.
b.
4.9 m/s2.
c.
9.8 m/s2.
 

 20. 

A book weighs 4 N. When held at rest in your hands, the net force on the book is
a.
0 N.
b.
0.4 N.
c.
4 N.
d.
39 N.
e.
none of the above
 

 21. 

An apple weighs 1 N. The net force on the apple when it is in free fall is
a.
0 N.
b.
0.1 N.
c.
1 N.
d.
9.8 N.
e.
none of the above
 

 22. 

A girl pulls on a 10-kg wagon with a constant force of 20 N. What is the wagon's acceleration?
a.
0.5 m/s2
b.
2 m/s2
c.
10 m/s2
d.
20 m/s2
e.
200 m/s2
 

 23. 

An object has a constant mass. A constant force on the object produces constant
a.
velocity.
b.
acceleration.
c.
both A and B
d.
none of the above
 

 24. 

A push on a 1-kilogram brick accelerates the brick. Neglecting friction, to equally accelerate a 10-kilogram brick, one would have to push
a.
with 100 times as much force.
b.
with 10 times as much force.
c.
with just as much force.
d.
with physicsch4to8_files/i0250000.jpg the amount of force.
e.
none of the above
 

 25. 

A rock is thrown vertically into the air. At the very top of its trajectory the net force on it is
a.
its weight.
b.
less than its weight.
c.
more than its weight.
 

 26. 

A box is dragged without acceleration in a straight-line path across a level surface by a force of 13 N. What is the frictional force between the box and the surface?
a.
13 N
b.
Less than 13 N
c.
More than 13 N
d.
Need more information to say.
 

 27. 

Pressure is defined as
a.
time per area.
b.
velocity per time.
c.
force per time.
d.
force per area.
e.
distance per time.
 

 28. 

Which of the following would exert the most pressure on the ground?
a.
A woman standing in running shoes
b.
A woman standing on skis
c.
A woman standing in high-heel shoes
 

 29. 

A tennis ball and a solid steel ball with the same diameter are dropped at the same time. Which ball has the greater force acting on it?
a.
The steel ball
b.
The tennis ball
c.
They both have the same force acting on them.
 

 30. 

The reason a tennis ball and a solid steel ball will accelerate at the same rate, in the absence of air resistance, is that
a.
they have the same mass.
b.
the ball with the larger force has the smaller mass.
c.
the ball with the larger force also has the larger mass.
d.
the force acting on them is the same.
e.
none of the above
 

 31. 

Aunt Minnie throws a rock downward, and air resistance is negligible. Compared to a rock that is dropped, the acceleration of the rock after it is thrown is
a.
less.
b.
the same.
c.
more.
 

 32. 

If you pull horizontally on a desk with a force of 150 N and the desk doesn't move, the friction force must be 150 N. Now if you pull with 250 N so the desk slides at constant velocity, the friction force is
a.
more than 150 N but less than 250 N.
b.
250 N.
c.
more than 250.
 

 33. 

When the angle of an incline with a block resting on it increases, the normal support force
a.
increases.
b.
stays the same.
c.
decreases.
 

 34. 

Consider a ball rolling down the decreasing slope inside a semicircular bowl (the slope is steep at the top rim, gets less steep toward the bottom, and is zero (no slope) at the bottom). As the ball rolls from the rim downward toward the bottom, its rate of gaining speed
a.
increases.
b.
remains the same.
c.
decreases.
 

 35. 

If the force acting on a cart doubles, what happens to the cart's acceleration?
a.
It quarters.
b.
It halves.
c.
It stays the same.
d.
It doubles.
e.
It quadruples.
 

 36. 

You are on a frozen pond, and the ice starts to crack. If you lie down on the ice and begin to crawl, this will
a.
increase the pressure on the ice.
b.
decrease the pressure on the ice.
c.
increase the total force on the ice.
d.
decrease the total force on the ice.
 

 37. 

A 20-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is
a.
0 N.
b.
4 N.
c.
16 N.
d.
20 N.
e.
none of the above
 

 38. 

A sportscar has a mass of 1500 kg and accelerates at 5 meters per second squared. What is the magnitude of the force acting on the sportscar?
a.
300 N.
b.
1500 N.
c.
2250 N.
d.
7500 N.
e.
none of the above
 

 39. 

You pull horizontally on a 50-kg crate with a force of 450 N and the friction force on the crate is 250 N. The acceleration of the crate is
a.
2 m/s2.
b.
4 m/s2.
c.
9 m/s2.
d.
14 m/s2.
 

 40. 

A jumbo jet cruises at a constant velocity when the total thrust of the engines on the jet is 50,000 N. How much air resistance acts on the jet?
a.
0 N
b.
25,000 N
c.
50,000 N
d.
75,000 N
e.
100,000 N
 

 41. 

A high school student hits a nail with a hammer. During the collision, there is a force
a.
on the nail but not on the hammer.
b.
on the nail and also on the hammer.
c.
on the hammer but not on the nail.
 

 42. 

Forces always occur
a.
as single quantities.
b.
by themselves.
c.
in pairs.
d.
in triplets.
 

 43. 

A player catches a ball. Consider the action force to be the impact of the ball against the player's glove. What is the reaction to this force?
a.
The muscular effort in the player's arms
b.
The force the glove exerts on the ball
c.
Friction of the ground against the player's shoes
d.
The player's grip on the glove
e.
none of the above
 

 44. 

A player hits a ball with a bat. The action force is the impact of the bat against the ball. What is the reaction to this force?
a.
The force of the ball against the bat
b.
The weight of the ball
c.
Air resistance on the ball
d.
The grip of the player's hand against the bat
e.
none of the above
 

 45. 

As a ball falls, the action force is the pull of Earth's mass on the ball. What is the reaction to this force?
a.
The pull of the ball's mass on Earth
b.
The acceleration of the ball
c.
Nonexistent in this case
d.
Air resistance acting against the ball
e.
none of the above
 

 46. 

A person is attracted towards the center of Earth by a 440-N gravitational force. The force with which Earth is attracted toward the person is
a.
440 N.
b.
very very small.
c.
very very large.
 

 47. 

An unfortunate bug splatters against the windshield of a moving car. Compared to the deceleration of the car, the deceleration of the bug is
a.
larger.
b.
the same.
c.
smaller.
 

 48. 

If a horse pulls on a wagon at rest, the wagon pulls back equally on the horse. Can the wagon be set into motion?
a.
Yes, because there is a net force acting on the wagon.
b.
Yes, because there is a time delay between action and reaction.
c.
No, because the forces cancel each other.
d.
Yes, because the horse's pull on the wagon is larger than the wagon's pull on the horse.
 

 49. 

Earth pulls on the moon, and similarly the moon pulls on Earth. This is evidence that the
a.
Earth and moon are simply pulling on each other.
b.
Earth's and moon's pulls comprise an action-reaction pair.
c.
both a and b
d.
neither a or b
 

 50. 

Nellie Newton holds an apple in her hand. If action is Earth pulling on the apple, then reaction is
a.
her hand providing a normal force on the apple.
b.
her hand pushing up on the apple.
c.
both A and B
d.
neither A nor B
 

 51. 

Bronco the skydiver falls toward Earth. The attraction of Earth on Bronco pulls him down. The reaction to this force is
a.
Bronco finally pushing against Earth's surface.
b.
Bronco pulling up on Earth.
c.
Earth's surface finally pushing against Bronco.
d.
neither A, B, nor C
 

 52. 

A rocket is able to accelerate in the vacuum of space when it fires its engines. The force that propels the rocket is the force
a.
of the rocket on the exhaust gases.
b.
of the exhaust gases on the rocket.
c.
neither A nor B
 

 53. 

A woman weighing 550 N sits on the floor. She exerts a force on the floor of
a.
5.5 N.
b.
55 N.
c.
550 N.
d.
1100 N.
e.
5500 N.
 

 54. 

Suppose two people, one having three times the mass of the other, pull on opposite sides of a 20-meter rope while on frictionless ice. After a brief time, they meet. The more massive person slides a distance of
a.
4 m.
b.
5 m.
c.
6 m.
d.
7 m.
 

 55. 

Compared to a sports car moving at 30 miles per hour, the same sports car moving at physicsch4to8_files/i0560000.jpgmiles per hour has
a.
twice as much momentum.
b.
four times as much momentum.
c.
the same momentum.
 

 56. 

The momentum change of an object is equal to the
a.
impulse acting on it.
b.
velocity change of the object.
c.
force acting on it.
d.
force acting on it times its velocity.
e.
object's mass times the force acting on it.
 

 57. 

The reason padded dashboards are used in cars is that they
a.
look nice and feel good.
b.
decrease the impulse in a collision.
c.
increase the force of impact in a collision.
d.
decrease the momentum of a collision.
e.
increase the time of impact in a collision.
 

 58. 

A table tennis ball launcher is fired. Compared to the force on the ball, the force on the launcher is
a.
larger.
b.
the same.
c.
smaller.
 

 59. 

Momentum of a system is conserved only when
a.
there are no internal forces acting on the system.
b.
the system is not moving.
c.
there are no forces acting on the system.
d.
there is no net external force acting on the system.
e.
the system has zero momentum.
 

 60. 

Suppose a girl is standing on a pond where there is no friction between her feet and the ice. In order to get off the ice, she can
a.
bend over touching the ice in front of her and then bring her feet to her hands.
b.
walk very slowly on tiptoe.
c.
get on her hands and knees and crawl off the ice.
d.
throw something in the direction opposite to the way she wants to go.
e.
all of the above will work
 

 61. 

Which of the following has the largest momentum?
a.
A large truck parked in a parking lot
b.
A tightrope walker crossing Niagara Falls
c.
The science building at your school
d.
A pickup truck traveling down the highway
e.
A dog running down the street
 

 62. 

A cannon fires a cannonball. The speed of the cannonball will be the same as the speed of the recoiling cannon
a.
if the mass of the cannonball equals the mass of the cannon.
b.
because momentum is conserved.
c.
because velocity is conserved.
d.
because both velocity and momentum are conserved.
e.
none of the above
 

 63. 

A 1-N apple falls to the ground. The apple hits the ground with an impact force of
a.
1 N.
b.
2 N.
c.
4 N.
d.
9.8 N.
e.
Not enough information to say
 

 64. 

A karate expert executes a swift blow and splits a cement block with her bare hand.
a.
The forces on both the block and the expert's hand have the same magnitude.
b.
The times of impact on both the block and the expert's hand are the same.
c.
The impulses on both the block and the expert's hand have the same magnitude.
d.
all of the above
e.
none of the above
 

 65. 

Suppose an astronaut in outer space wishes to toss a ball against a very massive and perfectly elastic concrete wall and catch it as it bounces back. If the ball is as massive as the astronaut, then
a.
the astronaut's time between catches will decrease as the game progresses.
b.
the astronaut will never catch the first bounce.
c.
the astronaut will catch one bounce only.
d.
none of the above
 

 66. 

A table tennis ball moving forward with 5 units of momentum strikes and bounces backward off a heavy bowling ball that is initially at rest and free to move. The bowling ball is set in motion with a momentum of
a.
less than 5 units.
b.
5 units.
c.
more than 5 units.
d.
not enough information.
 

 67. 

A small economy car (low mass) and a limousine (high mass) are pushed from rest across a parking lot, equal distances with equal forces. The car that receives the greater impulse is the
a.
limousine.
b.
small economy car.
c.
neither A nor B (same for each).
 

 68. 

A ball is moving at 6.0 m/s and has a momentum of 24.0 kg·m/s. What is the ball's mass?
a.
0.3 kg
b.
4.0 kg
c.
24.0 kg
d.
144.0 kg
e.
none of the above
 

 69. 

If you lift two loads up one story, how much work do you do compared to lifting just one load up one story?
a.
One quarter as much
b.
One half as much
c.
The same amount
d.
Twice as much
e.
Four times as much
 

 70. 

If you lift one load up two stories, how much work do you do compared to lifting one load up only one story?
a.
One quarter as much
b.
One half as much
c.
The same amount
d.
Twice as much
e.
Four times as much
 

 71. 

The unit of work is the
a.
watt.
b.
meter.
c.
joule.
d.
newton.
e.
second.
 

 72. 

Power is defined as the
a.
force on an object divided by the time the force acts.
b.
work done times the time taken to do that work.
c.
work done on an object divided by the time taken to do the work.
d.
distance divided by the time taken to move that distance.
e.
force on an object times the distance the object moves.
 

 73. 

The unit of power is the
a.
newton.
b.
meter.
c.
joule.
d.
second.
e.
watt.
 

 74. 

Potential energy is the energy an object has because of its
a.
density.
b.
size.
c.
location.
d.
speed.
e.
temperature.
 

 75. 

How much farther will a car traveling at 100 km/s skid than the same car traveling at 50 km/s?
a.
Half as far.
b.
The same distance.
c.
Twice as far.
d.
Four times as far.
e.
Five times as far.
 

 76. 

An arrow in a bow has 70 J of potential energy. Assuming no loss of energy to heat, how much kinetic energy will it have after it has been shot?
a.
0 J
b.
35 J
c.
50 J
d.
70 J
e.
140 J
 

 77. 

Energy is changed from one form to another with no net loss or gain.
a.
Sometimes true
b.
Always false
c.
Always true
 

 78. 

As a pendulum swings back and forth
a.
at the end points of its swing, its energy is all potential.
b.
at the lowest part of its swing, its energy is all kinetic.
c.
kinetic energy is transformed into potential energy.
d.
potential energy is transformed into kinetic energy.
e.
all of the above
 

 79. 

When a car’s speed triples, its kinetic energy
a.
remains the same.
b.
triples.
c.
increases by four times.
d.
increases by nine times.
e.
none of the above
 

 80. 

A job is done slowly, and an identical job is done quickly. Both jobs require the same amount of work but different amounts of
a.
energy.
b.
power.
c.
both A and B
d.
none of the above
 

 81. 

Which requires more work: lifting a 70-kg sack vertically 2 meters or lifting a 35-kg sack vertically 4 meters?
a.
Lifting the 70 kg sack
b.
Lifting the 35 kg sack
c.
Both require the same amount of work.
 

 82. 

A ball is thrown into the air with 100 J of kinetic energy, which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is
a.
100 J.
b.
more than 100 J.
c.
less than 100 J.
d.
Not enough information given.
 

 83. 

An object that has kinetic energy must have
a.
acceleration.
b.
a force applied to maintain it.
c.
momentum.
d.
none of the above
 

 84. 

Which has greater kinetic energy, a car traveling at 30 km/h or a half-as-massive car traveling at 60 km/h?
a.
The 60 km/h car
b.
Both have the same kinetic energy.
c.
The 30 km/h car
 

 85. 

An object at rest may have
a.
energy.
b.
speed.
c.
velocity.
d.
momentum.
e.
none of the above
 

 86. 

If an object has kinetic energy, then it also must have
a.
impulse.
b.
force.
c.
momentum.
d.
acceleration.
e.
none of the above
 

 87. 

If the velocity of a moving object doubles, then what else doubles?
a.
acceleration.
b.
kinetic energy.
c.
momentum.
d.
all of the above
e.
none of the above
 

 88. 

All simple machines ideally work on the principle that
a.
impulse equals momentum change.
b.
force equals mass times acceleration.
c.
total momentum before a collision equals total momentum after the collision.
d.
work input equals work output.
e.
kinetic energy transforms into potential energy.
 

 89. 

A pulley system can
a.
change the direction of a force.
b.
multiply the force.
c.
increase the amount of work done.
d.
Both A and B
e.
Both B and C
 

 90. 

The ratio of useful work output to total work input is called the
a.
mechanical advantage.
b.
lever arm.
c.
pivot point.
d.
fulcrum.
e.
efficiency.
 

 91. 

How many joules of work are done on a box when a force of 25 N pushes it 3 m?
a.
1 J
b.
3 J
c.
8 J
d.
25 J
e.
75 J
 

 92. 

How much power is required to do 40 J of work on an object in 5 seconds?
a.
0 W
b.
5 W
c.
8 W
d.
40 W
e.
200 W
 

 93. 

How much work is done on a 60-N box of books that you carry horizontally across a 6-m room?
a.
0 J
b.
6 J
c.
10 J
d.
60 J
e.
360 J
 

 94. 

How much work is done on a 20-N crate that you lift 2 m?
a.
0 J
b.
1 J
c.
2 J
d.
20 J
e.
40 J
 

 95. 

How much power is expended if you lift a 60 N crate 10 meters in 1 second?
a.
0 W
b.
6 W
c.
10 W
d.
60 W
e.
600 W
 

 96. 

Suppose a moving car has 3000 J of kinetic energy. If the car's speed doubles, how much kinetic energy will it then have?
a.
1000 J
b.
1500 J
c.
3000 J
d.
6000 J
e.
12,000 J
 

 97. 

If Kelly the skater's speed increases so he has three times the momentum, then his kinetic energy increases by
a.
one third times.
b.
three times.
c.
nine times.
d.
none of the above (KE remains the same).
 

 98. 

A 60-N object moves at 1 m/s. Its kinetic energy is
a.
1 J.
b.
3 J.
c.
60 J.
d.
more than 60 J.
 

 99. 

Sue can easily lift a 45.0-N rock with the help of a lever. When she pushes down with 20.0 N of force, she lifts the rock 0.3 meters. How far does she move her arms to do this?
a.
0.3 m
b.
0.7 m
c.
6.0 m
d.
2.3 m
e.
20.0 m
 

 100. 

A pulley has two supporting strands. In order for it to lift a load 1 meter, the person pulling will have to pull a distance of
a.
physicsch4to8_files/i1010000.jpg m.
b.
physicsch4to8_files/i1010001.jpg m.
c.
1 m.
d.
2 m.
e.
4 m.
 



 
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