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When you throw something the change in velocity depends on the force (F) that you use and the time for which it acts (t).
We call the product of force and time the IMPULSE. The bigger the impulse the bigger the change in velocity it will produce.

Impulse = force x time = Ft

The units of impulse are Newton seconds (Ns).

The same arguments apply when you catch something. The less time you take to catch it the bigger the force and so the more it hurts.

© Keith Gibbs 2009