# A model train, with a mass of #8# #kg#, is moving on a circular track with a radius of #1# #m#. If the train's kinetic energy changes from #32# #J# to #0# #J#, by how much will the centripetal force applied by the tracks change?

##### 1 Answer

The centripetal force is given by

#### Explanation:

The kinetic energy is given by

The final kinetic energy is zero and therefore the final velocity is zero.

We can use the mass, radius and initial kinetic energy to calculate the initial velocity:

Since the final velocity is zero, the final centripetal force will be zero. The initial centripetal force will be:

Since the final centripetal force is *change* in the centripetal force is:

final - initial =