# A model train, with a mass of #4 kg#, is moving on a circular track with a radius of #6 m#. If the train's kinetic energy changes from #24 j# to #96 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Mar 27, 2016

The radius of circular path (r)=6m

Initial velocity,

final velocity,

Initial KE,

final KE,

Change in KE =

Dividing both sides of this equation by radius (r)of circular path and multiplying both sides by 2 we have

We see that left side of the equation is the change in centripetal force

So The change in centripetal force is