Aweaver+Physlets

Physlets:

8.1: If the mass is changed, the momentum doesn't change. However, when the time the force is being applied is changes, it causes a change in momentum. This relationship can be explained by the force vs. time curve. The area under the curve is the impulse.

8.2: A change in mass will also cause a change in speed which will cause a change in kinetic energy. Greater masses will have greater acceleration.

8.3: The forces must always be opposite and equal. If the momentum of one decreases, the momentum of the other must increase to accomodate. So, the sum of the impulses of each of the balls must be equal to zero.