Linear Momentum Multiple Choice

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 experience 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

A

A sailboat of mass m is moving with a momentum of p. How would you represent its kinetic energy in terms of these two quantities?
A) p^2/(2m)
B) 1/2mp^2
C) mp
D) mp/2

A

The area under the curve on a Force versus time (F vs. t) graph represents
A) impulse
B) momentum
C) work
D) kinetic energy

A

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

A

A 3.0-kg object moves to the right at 4.0m/s. It collides head-on with a 6.0-kg object moving to the left at 2.0m/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 kg m/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

C

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
D) equal to 3.0 m/s
D) much less than 3.0 m/s

A

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/s1

D

A red ball with a velocity of +3.0 m/s collides head-on with a yellow fall 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

B

A very heavy object moving with velocity v collides head-on with a very light object moving with a velocity of -v. The collision is elastic, and there is no fraction. 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

C

In an inelastic 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

C

Two objects collide and stick together. Kinetic energy
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

B

A 3.0-kg object moves to the right at 4.0 m/s. It collides in a perfectly inelastic collision with a 6.0 kg object moving to the left at 2.0 m/s. What is the total kinetic energy after the collision?
A) 72
B) 36 J
C) 24 J
D) 0 J

D

In a game of pool, the white cue ball its the #9 ball and is deflected at a 35 degree angle to the original line of motion. What is the angle of deflection below the original line of motion for the #9 ball?
A) 35
B) 55
C) 75
D) 90

B

Consider two unequal masses, M and m. Which of the following statements is false?
A) The center of mass lies on the line joining the centers of each mass.
B) The center of mass is closer to the larger mass.
C) It is possible for the center of mass to lie within one of the the objects?
D) If a uniform rod of mass m were to join the two masses, this would not alter the position of the center of mass of the system without the rod present.

D

Which of the following is a false statement?
A) For a uniform symmetric object, the center of mass is at the center of symmetry.
B) For an object on the surface of the Earth, the center of gravity and the center of mass are on the same point.
C) The center of mass of an object must lie within the object.
D) The center of gravity of an object may be thought of as the "balance point"

C

A plane, flying horizontally, releases a bomb, which explodes before hitting the ground. Neglecting air resistance, the center of mass of the bomb fragments, just after the explosion
A) is zero
B) moves horizontally
C) moves vertically
D) moves along a parabolic path

D

Two cars collide head-on on a levee friction-free road. The collision was completely inelastic and both cars quickly came to rest during the collision. What is true about the velocity of this system's center of mass?
A) It was always zero
B) It was never zero
C) It was not zero, but ended up zero
D) none of the above

A