# A model train, with a mass of #2 kg#, is moving on a circular track with a radius of #4 m#. If the train's kinetic energy changes from #2 j# to #16 j#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Feb 19, 2016

#### Answer:

It will increase

#### Explanation:

Since the kinetic energy is

(Assuming mass remains constant.)

Now the centripetal force is given my

So assuming the mass and radius stays the same, if

Now the initial velocity was

So initial centripetal force was

Therefore the new centripetal force will be