## COLLISIONS

__Introduction__This topic is about spheres which collide with a barrier (impacts) or which collide with another sphere (collisions). There are four main types of question:

**Direct impacts****Oblique impacts****Direct collisions****Oblique collisions**

**Common Mistakes**

• Forgetting to put the minus in front of

*e*in NEL.

• Applying NEL to both directions, not just to the direction of impact.

• Confusing momentum and kinetic energy.

• Forgetting the definition of impulse, even though it is on Page 40 of The Mathematical Tables!

q5._collisions.doc | |

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