The force on the squash ball in the previous question is an average force and often the force changes during the collision. For this example the force–time graph could look like this. Notice the peak ...

Segment 4A: Momentum and Impulse We define the terms momentum and impulse. Segment 4A: Momentum and Impulse We define the terms momentum and impulse. We see the impulse-momentum theorem in action by ...

When it comes to measuring the "hardness" of a material, most tests are distinctly low-tech and basically involve pressing a diamond tip into the surface and measuring the size of the dent produced.

Work close workEnergy transferred by a force. Work done = force × distance moved in the direction of the force. is done when energy is transferred from one store to another. Work is also done when a ...