9.
What is the law of conservation of momentum?

10.
If you jump off a boat with 381 kg·m/s of momentum, what is the momentum change for
the boat?

11.
Momentum is neither lost nor gained unless acted on by an outside force.
The boat will have a momentum change of 381 kg·m/s.
What is the only way a system will change in momentum?

Momentum can only change when an outside force is applied on the system.
12.
What is the speed of a 25 kg Nerf gun after a 0.051 kg ball is launched from it at a speed
of 22.1 m/s?
13.
What two units are used to measure energy?

14.
An object at rest on top of a bookcase will have what kind of energy?

15.
16.
A book at rest will have potential energy.
A 0.500 kg baseball moving at 41.5 m/s would have what kind of energy? How much
energy?

The moving baseball has kinetic energy.

KE = ½ mv2 = ½ (0.500 kg)(41.5 m/s)2 = 431 J
A 4.000 kg object moves at 10.0 m/s. What is the object's kinetic energy?

17.
Energy is measure in Joules or calories.
KE = ½ mv2 = ½ (4.000 kg)(10.0 m/s)2 = 200. J
What is the potential energy of a 3.14 kg dog sitting on a 0.850 m couch?

PE = mgh = (3.14 kg)(9.8 m/s2)(0.850 m) = 26.2 J