2. A Mack truck and a Volkswagen traveling at the same speed have a
head-on collision. The vehicle to undergo the greatest change in velocity
will be the
a. Volkswagen c. both the same
b. Mack truck
3. A car traveling at 100 km/hr strikes a hapless bug and splatters
it. The force of impact is greater on the
a. bug c. ... is the same for both
b. car
4. A horse exerts 500 N of force on a heavy wagon. The wagon pulls back
on the horse with an equal force. The wagon still accelerates because
a. these forces are not an action-reaction pair
b. nevertheless there is still an unbalanced force on the wagon
c. the horse pulls on the wagon a brief time before the wagon reacts
d. ...the wagon does not accelerate because these forces are equal
and opposite
e. none of these
5. A rifle of mass 2 kg is suspended by strings. The rifle fires a bullet
of mass 1/100 kilogram at a speed of 200 m/s. What is the recoil velocity
of the rifle?
a. 0.001 m/s d. 1 m/s
b. 0.01 m/s e. none of these
c. 0.1 m/s
6. A boxcar rolling free along a side track at 2 m/s strikes and couples
with another boxcar of equal mass. The speed of the two boxcars moving
together immediately after the collision is
a. 2 m/s
b. 1 m/s
c. less than 1 m/s
d. can't be determine without data on the energy lost.
7. A projectile is fired at a tall piece of wood. Assuming that
impact times are the same, the impact force on the block is greatest when
a. the projectile goes through the block
b. the projectile is stopped by the block
d. the projectile bounces back from the block.
8. An object that has potential energy has this energy because of its
a. speed d. location
b. acceleration e. none of these
c. momentum
9. Two objects, A and B, have the same size and shape but A is twice
as heavy as B. When they are dropped simultaneously from a tower, they
reach the ground at the same time (neglecting friction), but A has
a higher
a. speed d. all of the above
b. acceleration e. none of the above
c. momentum
10. Bullets are fired from an airplane in the forward direction of motion.
The momentum of the airplane will be
a. decreased c. increased
b. unchanged
11. An object at rest may have
a. speed d. momentum
b. velocity e. none of these
c. energy
12. A 400 N woman stands on top of a very tall ladder so she is one
Earth radius above the Earth's surface. How much does she weigh?
a.zero d. 400 N
b. 100 N e. none of these
b. 200 N
13. On a meter stick which is balanced at its center, a 100 gm mass
is hung at a distance 10 cm from the center and another 100 gm mass is
hung 20 cm from the center on the same side. The system will balance if
a 200 gram mass is hung on the other side of the center at a distance from
the center of
a. 10 cm
b. 15 cm
d. 20 cm
e. 30 cm
14. When the distance between two stars decreases to half, the force
between them
a. decreases to one quarter
b. decreases to one half
c. doubles
d. quadruples
e. none of the above
15. When a bullet is fired from a rifle, the force on the rifle is equal
to the force on the bullet. However, the kinetic energy of the bullet is
greater than the kinetic energy of the recoiling rifle because the
a. force on the bullet acts for a longer distance
b. bullet's momentum is greater than that of the rifle
c. force on the bullet acts for a longer time
d. bullet velocity is greater and kinetic energy depends more strongly
on velocity
e. none of these
16. If the Earth's mass decreased to one-half its original mass with
no change in radius, then your weight would
a. decrease to one quarter of your original weight
b. decrease to one half of your original weight
c. stay the same
d. none of these
17. A popular swinging-balls apparatus consists of an aligned row of
identical elastic balls that are suspended by strings so they barely touch
each other. When two balls are lifted from one end and released, they strike
the row and two balls pop out from the other end. If instead one ball popped
out with twice the velocity of the two, this would be a violation of the
principle of conservation of
a. momentum c. both of the above
b. energy d. none of the above
18. A car accelerates at 2 meters per second squared. What is its speed
3 seconds after the car starts moving?
a. 2 m/s d. 6 m/s
b. 3 m/s e. none of these
c. 4 m/s
19. When a rock thrown straight upward 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
squared.
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 squared.
e. none of these.
20. A bullet is dropped from the top of the Empire State Building while
another bullet is fired downward from the same place. After the bullet
has left the gun, neglecting air resistance, acceleration is greatest for
the
a. fired bullet
b. dropped bullet
c. ... is 9.8 m/s2 for each
d. depends on how far they are above the earth.
21. 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
greatest speed will be the one initially thrown
a. upward. c. ... they will both hit
b. downward with the same speed.
22. The impact force of a rock falling to the ground from a height of
10 meters
a. is determined entirely by its mass and original height
b. is determined entirely by its mass and the velocity with which it
hits
d. cannot be determined without knowing how far the rock traveled after
impact.
23. If a car travels further during a collision (i.e., collapses more)
a. more work will be done on it.
b. the change in kinetic energy will be greater
c. the change in momentum will be less
d. the average force of impact will be less
24. A net force of 50 newtons acts on a 2 kg block and moves it 4 meters
in the direction of the force. The work done on the block is
a. 100 joules
b. 200 joules
c. 400 joules
d. 1000 joules
25. A satellite near the Earth makes a full circle in about an hour
and a half. How long would a satellite located as far away as the Moon
take to orbit the earth?
a. about 28 days
b. about an hour and a half
c. it depends on the mass of the satellite
d. a satellite could not be put in such an orbit.
e.none of these
26. If you have to stop quickly on the expressway,
a. you always get a shorter stopping distance if your wheels are rolling
rather than locked.
b. you get a shorter distance if your wheels are locked rather than
rolling.
c. you get a shorter stopping distance with wheels rolling provided
you are very near the maximum static friction force.
27. 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, what is the sack's acceleration?
a. 0 d. infinite
b. 4.9 m/s2 e. none of these
c. 9.8
28. A bullet fired horizontally hits the ground in 0.5 seconds. If it
had been fired with a much higher speed in the same direction, it would
have hit the ground (neglecting the earth's curvature and air resistance
) in
a. less than 0.5 sec c. 0.5 seconds.
b. more than 0.5 sec
29. If a car traveling at 20 meters/s is stopped by friction in a distance
d, then a car traveling at 40 m/s would require a stopping distance of
about
a. d
b. square root of 2 times d
c. 2d
d. 4d
30. An object is placed halfway between the Earth and Moon. The object
will fall toward the
a. Moon c. neither of these
b. Earth
31. A woman on the surface of the Earth has a mass of 50 kilograms and
a weight of 490 newtons. If the woman were floating freely inside a space
habitat far away from Earth, she would have
a. less weight and more mass
b. less weight and the same mass.
c. less weight and less mass
d. more weight and less mass.
e. none of these.
32. A man falling through the air with a parachute weighs 500 N. When
he opens his chute, he experiences and initial air resistance force of
800 N. The net force on the man is at that time is
a. 300 N downward d. 300 N upward
b. 500 N downward e. 500 N upward
c. 800 N upward
33. 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. the milk carton has no acceleration.
b. there is an action-reaction pair operating.
c. the gravitational field pulls on the milk carton.
d. the milk carton has inertia
e. none of these
34. Compared to its mass on the Earth, the mass of an object on the
Moon is
a. less
b. more
c. the same
35. Suppose an object's mass is decreasing. If a constant force is applied
to the object, the acceleration
a. decreases c. remains the same
b. increases
36. A car traveling at 40 km/hr around a particular curve requires
a frictional force on the tires of 400 newtons to keep the car in the circular
path. If the car rounded the same curve at 80 km/hr, the sideways force
required from the road would be
a. 400 N
b. 200 N
c. 800 N
d. 1600 N
37. The force of friction on a sliding object is 10 Newtons. The force
needed to maintain a constant velocity is
a. more than 10 N c. 10 N
b. less than 10 N
38. An apple weighs 1 N. The net force on the apple when it is in free
fall is
a. 0 N d. 9.8 N
b. 0.1 N e. none of these
c. 1 N
39. A tow truck exerts a force of 3000 N on a car, accelerating it at
2 m/s2. What is the mass of the car?
a. 500 kg d. 3000 kg
b. 1000 kg e. none of these
c. 1500 kg
40. A bag of groceries has a mass of 10 kg and a weight of about
a. 1 N d. 1000 N
b. 10 N e. none of these
c. 100 N
41. An object following a straight-line path at constant speed
a. has a net force acting upon it in the direction of motion
b. has zero acceleration
c. must be moving in a vacuum
d. has no forces acting on it
e. none of the above
42. Neglecting air friction and lift, the "hang time" of a punted football
would depend upon
a. the initial vertical velocity only
b. the initial horizontal velocity only
c. both the initial vertical and horizontal velocity.
43. 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 newtons
b. equal to the weight of the puck
c. the weight of the puck divided by the mass of the puck
d. the mass of the puck multiplied by 9.8 m/s2.
e. none of these
44. 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
a. equal forces on each block
b. ten times as much force on the heavier block
c. ten 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
45. Suppose a particle is accelerated through space by a 10 N force.
Suddenly the particle encounters a second force of 10 N in the opposite
direction of the first force. The particle
a. is brought rapidly to a halt.
b. decelerates gradually to a halt
c. continues at the speed it had when it encountered the second force.
d. theoretically accelerates to speeds approaching the speed of light
in the absence of a net force
e. none of these.
46. In which case would you have the largest mass of gold? If your chunk
of gold weighed 1 N on the
a. Moon c. planet Jupiter
b. Earth
47. 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 pair force
to this force?
a. the player's force on the glove
b. the force the glove exerts on the ball
c. friction of the ground against the player's shoes
d. the muscular effort of the player's arms
e. none of these
48. A car traveling at 22 m/s hits a tree and comes to a stop. The driver's
seatbelt minimizes the force on the driver by
a. making the drivers stopping distance shorter than that of the car
b. reducing the work that must be done to stop the driver
c. making the driver's stopping distance equal to or greater than the
stopping distance of the car.
d. reducing the impulse on the driver.
49. A person is attracted toward the center of the earth by a 500 N
gravitational force. The force with which the earth is attracted toward
the person is
a. very very small c. 500 N
b. very very large
50. In order to catch a ball, a baseball player moves his or her hand
backward in the direction of the ball's motion. Doing this reduces the
force of impact on the players hand principally because
a. the resultant velocity of impact is lessened
b. the momentum of impact is reduced
c. the time of impact is increased
d. the time of impact is decreased
e. none of these
51. A car traveling along the highway needs a certain amount of force
exerted on it to stop in a given distance. More stopping force may be required
when the car has
a. more mass d. all of the above
b. more momentum e. none of the above
c. higher velocity
52. The force on an apple hitting the ground depends upon
a. whether or not the apple bounces
b. the speed of the apple just before it hits
c. the time of impact with the ground
d. the distance the apple moves after impact
e. all of these
f. none of these
53. When you jump from an elevated position you usually bend your knees
upon reaching the ground. By doing this, the distance traveled during
the impact is about 10 times more than it would be in a stiff-legged landing.
In this way the average force your body experiences is reduced by
a. less that 10 times c. about 10 times
b. more than 10 times
54. A ball is launched straight upward with an initial speed of
20 m/s. Assuming a value of 10 m/s2 for the acceleration of gravity, it
will reach the top of its motion in
a. 1 second
b. 2 seconds
c. 3 seconds
d. 4 seconds
It will reach a maximum height of
a. 10 m
b. 20 m
c. 30 m
d. 40 m
55. A karate expert executes a swift blow and severs a cement block
with her or his hand. The
a. impulse on both the block and the expert's hand have the same magnitude
b. force on both the block and the expert's hand have the same magnitude
c. time of impact on both the block and the expert's hand have the
same magnitude
d. all of the above
e. none of the above
56. As an object freely falls, its
a. velocity increases
b. acceleration increases.
c. both of the above
d. none of the above
57. If an object falls with constant acceleration, the velocity
of the object must
a. be constant also
b. continually change by the same amount each second.
c. continually change by varying amounts depending on its speed at
any point.
d. continually decrease
e. none of these
58. A ball is thrown upwards and caught when it comes back down. Neglecting
air resistance, the speed with which it is caught is
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.
59. In a karate blow to a board, assuming the same speed of the hand
just before the blow, the maximum force to the hand will occur if
a. the board breaks and the hand continues past the point of contact
b. the board exactly stops the hand
c. the hand bounces back from the board without breaking it
60. A car travels in a circle with constant speed. the net force on
the car
a. is directed forward, in the direction of travel
b. is zero because the car is traveling with constant speed
c. is directed toward the center of the circle
d. none of these
61. A 1 kg chunk of putty moving at 1 m/s collides and sticks
to a 5 kg bowling ball that is initially at rest. The bowling ball with
its putty passenger is then set in motion with a momentum of
a. 0 kg m/s d. 5 kg m/s
b. 1 kg m/s e. none of these
c. 6 kg m/s
62. If the polar ice caps melted, the resulting water would spread over
the entire Earth. This new mass distribution would tend to make the length
of day
a. longer c. stay the same
b. shorter
63. Suppose an astronaut in outer space wishes to play a solitary 'throw,
bounce, and catch' game by tossing a ball against a very massive and perfect
elastic concrete wall. If the ball is as massive as the astronaut
a. the astronaut will catch one bounce only.
b. the astronaut's time between catches will decrease as the game progresses.
c. the astronaut will never catch the first bounce
d. none of these
64. The reason the Moon does not fall into the Earth is that
a. the Earth's gravitational field is weak at the moon.
b. the gravitational pull of other planets keeps the Moon up
c. the Moon has a sufficiently large orbital speed
d. the Moon has less mass than the Earth
e. none of these
65. What makes a chemical element distinct?
a. the number of protons
b. the number of neutrons
c. the number of electrons
d. the total mass of all the particles
e. none of these
66. Which potatoes when peeled produce the most peelings?
a. 10 kg of large potatoes
b. 10 kg of small potatoes
c. they both produce the same amount.
67. A box of weight 100 newtons is lifted to a height of 5 meters above
the floor. If it is released from rest and falls toward the floor, the
kinetic energy it has just before it hits the floor is
a. 100 newtons
b. 100 joules
c. 500 joules
d. 50 joules