# A model train, with a mass of #24 kg#, is moving on a circular track with a radius of #3 m#. If the train's kinetic energy changes from #18 j# to #21 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Mar 5, 2016

2N

#### Explanation:

Mass of the train m= 24kg

The radius of circular path (r)=3m

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