# Solved > 1) Consider two less-than-desirable options. In the first:2026812 …

1) Consider two less-than-desirable options. In the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. In the second option you are driving 30 mph and crash head-on into a stationary brick wall. In neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. Which of these two situations would result in the greatest impact force?

A) hitting the other car

B) hitting the brick wall

C) The force would be the same in both cases.

E) None of these is true.

2) As a tile falls from the roof of a building to the ground its momentum is conserved.

A) True B) False

3) You are standing on a skateboard, initially at rest. A friend throws a very heavy ball towards you. You can either catch the object or deflect the object back towards your friend (such that it moves away from you with the same speed as it was originally thrown). What should you do in order to MINIMIZE your speed on the skateboard?

A) Deflect the ball.

B) Catch the ball.

C) Your final speed on the skateboard will be the same regardless whether you catch the ball or deflect the ball.

4) On a smooth horizontal floor, an object slides into a spring which is attached to another mass that is initially stationary. When the spring is most compressed, both objects are moving at the same speed. Ignoring friction, what is conserved during this interaction?

A) kinetic energy only

B) momentum and mechanical energy

C) momentum and kinetic energy

D) momentum only

E) momentum and potential energy

5) A baseball is thrown vertically upward and feels no air resistance. As it is rising

A) its kinetic energy is conserved, but its momentum is not conserved.

B) both its momentum and its kinetic energy are conserved.

C) its momentum is not conserved, but its mechanical energy is conserved.

D) both its momentum and its mechanical energy are conserved.

E) its gravitational potential energy is not conserved, buts its momentum is conserved.

6) A small glider is coasting horizontally when suddenly a very heavy piece of cargo falls out of the bottom of the plane. You can neglect air resistance. Just after the cargo has fallen out

A) the plane speeds up but the cargo does not change speed.

B) both the cargo and the plane speed up.

C) neither the cargo nor the plane change speed.

D) the plane speeds up and the cargo slows down.

E) the cargo slows down but the plane does not change speed.

7) A small car has a head-on collision with a large truck. Which of the following statements concerning the magnitude of the average force due to the collision is correct?

A) The truck experiences the greater average force.

B) The small car and the truck experience the same average force.

C) The small car experiences the greater average force.

D) It is impossible to tell since the masses are not given.

E) It is impossible to tell since the velocities are not given.

8) In a collision between two objects having unequal masses, how does magnitude of the impulse imparted to the lighter object by the heavier one compare with the magnitude of the impulse imparted to the heavier object by the lighter one?

A) The heavier object receives a larger impulse.

B) The lighter object receives a larger impulse.

C) Both objects receive the same impulse.

D) The answer depends on the ratio of the masses.

E) The answer depends on the ratio of the speeds.

9) In a perfectly ELASTIC collision between two perfectly rigid objects

A) the kinetic energy of each object is conserved.

B) the momentum of each object is conserved.

C) the momentum of the system is conserved but the kinetic energy of the system is

not conserved.

D) the kinetic energy of the system is conserved, but the momentum of the system is

not conserved.

E) both the momentum and the kinetic energy of the system are conserved.

10) In an INELASTIC collision between two objects

A) the momentum of each object is conserved.

B) the kinetic energy of each object is conserved.

C) the momentum of the system is conserved but the kinetic energy of the system is

not conserved.

D) the kinetic energy of the system is conserved, but the momentum of the system is

not conserved.

E) both the momentum and the kinetic energy of the system are conserved.

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