All moving objects have momentum. Forces can cause changes in momentum. The total momentum in a collision or explosion is conserved and stays the same. Car safety features absorb energy involved in a crash they slow down the collision thus reducing the force of impact.
Demo
In this tutorial you will learn how to calculate the change in momentum and the affect it has on impact forces.
The equation is written like this:
$F = { mv \unicode{x2013} mu \over \text{t}}$
Chilled practice question
Calculate the force acting if there is a change in momentum from zero to 168 Kgm/s for 7 s.
Frozen practice question
A 50 kg gymnast is thrown in the air and travels at 5 m/s. The contact time to throw the gymnast is 0.5 seconds. Calculate the force acting on the gymnast.
Science in context
.All moving objects have momentum. Forces can cause changes in momentum. The total momentum in a collision or explosion is conserved and stays the same. Car safety features absorb energy involved in a crash they slow down the collision thus reducing the force of impact.
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