Chapter 7: Linear Momentum
- 1.What is the SI unit of momentum?
- A.
N*m
- B.
N/s
- C.
N*s
- D.
N/m
- 2.When a cannon fires a cannonball, the cannon will recoil backward because the
- A.
Energy of the cannonball and cannon is conserved.
- B.
Momentum of the cannonball and cannon is conserved.
- C.
Energy of the cannon is greater than the energy of the cannonball.
- D.
Momentum of the cannon is greater than the energy of the cannonball.
- 3.A freight car moves along a frictionless level railroad track at constant speed. The car is open on top. A large load of coal is suddenly dumped into the car. What happens to the velocity of the car?
- A.
It increases.
- B.
It remains the same.
- C.
It decreases.
- D.
Cannot be determined from the information given.
- 4.A child falls sideways off a sled while sledding on frictionless ice. What happens to the velocity of the sled?
- A.
It increases.
- B.
It remains the same.
- C.
It decreases.
- D.
Cannot be determined from the information given.
- 5.A rubber ball and a lump of putty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall. Which objects experiences the greater momentum change?
- A.
The ball
- B.
The putty
- C.
Both experience the same momentum change.
- D.
Cannot be determined from the information given.
- 6.A sailboat of mass m is moving with a momentum p. How would you represent its kinetic energy in terms of these two quantities?
- A.
(p^2)/(2m)
- B.
(1/2)mp^2
- C.
Mp
- D.
Mp/2
- 7.If you pitch a baseball with twice the kinetic energy you gave it in the previous pitch, the magnitude of its momentum is
- A.
The same.
- B.
1.41 times as much.
- C.
Doubled.
- D.
4 times as much.
- 8.The area under the curve on a Force versus time (F vs. t) graph represents
- A.
Impulse.
- B.
Momentum.
- C.
Work.
- D.
Kinetic energy.
- 9.Which of the following is an accurate statement?
- A.
The momentum of a projectile is constant.
- B.
The momentum of a moving object is constant.
- C.
If an object is acted on by a non-zero net external force, its momentum will not remain constant.
- D.
If the kinetic energy of an object is doubled, its momentum will also double.
- 10.A small car meshes with a large truck in a head-on collision. Which of the following statements concerning the magnitude of the average collision force is correct?
- A.
The truck experiences the greater average force.
- B.
The small car experiences the greater average force.
- C.
The small car and the truck experience the same average force.
- D.
It is impossible to tell since the masses and velocities are not given.
- 11.Two equal mass balls (one red and the other blue) are dropped from the same height, and rebound off the floor. The red ball rebounds to a higher position. Which ball is subjected to the greater magnitude of impulse during its collision with the floor?
- A.
It's impossible to tell since the time intervals and forces are unknown.
- B.
Both balls were subjected to the same magnitude impulse.
- C.
The blue ball
- D.
The red ball
- 12.A Ping-Pong ball moving east at a speed of 4 m/s, collides with a stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?
- A.
Neither; both experienced the same magnitude impulse.
- B.
The Ping-Pong ball
- C.
The bowling ball
- D.
It's impossible to tell since the velocities after the collision are unknown.
- 13.Two objects collide and bounce off each other. Linear momentum
- A.
Is definitely conserved.
- B.
Is definitely not conserved.
- C.
Is conserved only if the collision is elastic.
- D.
Is conserved only if the environment is frictionless.
- 14.A 3.0-kg object moves to the right at 4.0 m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0 m/s. Which statement is correct?
- A.
The total momentum both before and after the collision is 24 kg*m/s.
- B.
The total momentum before the collision is 24 kgoem/s, and after the collision is 0 kg*m/s.
- C.
The total momentum both before and after the collision is zero.
- D.
None of the above is true.
- 15.A 100-kg football linebacker moving at 2.0 m/s tackles head-on an 80-kg halfback running 3.0 m/s. Neglecting the effects due to digging in of cleats,
- A.
The linebacker will drive the halfback backward.
- B.
The halfback will drive the linebacker backward.
- C.
Neither player will drive the other backward.
- D.
This is a simple example of an elastic collision.
- 16.In an elastic collision, if the momentum is conserved, then which of the following statements is true about kinetic energy?
- A.
Kinetic energy is also conserved.
- B.
Kinetic energy is gained.
- C.
Kinetic energy is lost.
- D.
None of the above
- 17.When is kinetic energy conserved?
- A.
In elastic collisions
- B.
In inelastic collisions
- C.
In any collision in which the objects do not stick together
- D.
In all collisions
- 18.In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of collision is
- A.
Elastic.
- B.
Inelastic.
- C.
Completely inelastic.
- D.
Any of the above, depending on the mass of the balls.
- 19.When a light beach ball rolling with a speed of 6.0 m/s collides with a heavy exercise ball at rest, the beach ball's speed after the collision will be, approximately,
- A.
0.
- B.
3.0 m/s.
- C.
6.0 m/s.
- D.
12 m/s.
- 20.A golf ball traveling 3.0 m/s to the right collides in a head-on collision with a stationary bowling ball in a friction-free environment. If the collision is almost perfectly elastic, the speed of the golf ball immediately after the collision is
- A.
Slightly less than 3.0 m/s.
- B.
Slightly greater than 3.0 m/s.
- C.
Equal to 3.0 m/s.
- D.
Much less than 3.0 m/s.
- 21.A rubber ball with a speed of 5.0 m/s collides head-on elastically with an identical ball at rest. What is the speed of the initially stopped ball after the collision?
- A.
Zero
- B.
1.0 m/s
- C.
2.5 m/s
- D.
5.0 m/s
- 22.A very heavy object moving with speed v collides head-on with a very light object at rest. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?
- A.
Nearly v
- B.
Nearly 2v
- C.
Nearly 3v
- D.
Nearly infinite
- 23.A very light object moving with speed v collides head-on with a very heavy object at rest, in a frictionless environment. The collision is almost perfectly elastic. The speed of the heavy object after the collision is
- A.
Slightly greater than v.
- B.
Equal to v.
- C.
Slightly less than v.
- D.
Much less than v.
- 24.A red ball with a velocity of +3.0 m/s collides head-on with a yellow ball of equal mass moving with a velocity of -2.0 m/s. What is the velocity of the yellow ball after the collision?
- A.
Zero
- B.
+3.0 m/s
- C.
-2.0 m/s
- D.
+5.0 m/s
- 25.A very heavy object moving with velocity v collides head-on with a very light object moving with velocity -v. The collision is elastic, and there is no friction. The heavy object barely slows down. What is the speed of the light object after the collision?
- A.
Nearly v
- B.
Nearly 2v
- C.
Nearly 3v
- D.
Nearly infinite
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Sample QuestionMomentum has
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Sample QuestionThe momentum of a body is equal to its mass multiplied by its velocity.
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Sample Question1. The mass 'm' of the object is moving with a straight line motion and another object is mass equal to the first object and it is moving along the same direction. after collision what is the speed of the both objects
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