# A model train, with a mass of #6 kg#, is moving on a circular track with a radius of #1 m#. If the train's kinetic energy changes from #27 j# to #36 j#, by how much will the centripetal force applied by the tracks change by?

##### 2 Answers

18 N

#### Explanation:

Let'assume Kinetic energy in the 1st case is K1 and in 2nd case K2

So,

Now, Centripetal force F is given as

As,mass and radius are unchanged so we can say,

Initial Centripetal force was

Now it has become 4/3 rd i.e 72 so change occurred by (72-54)=18 N

The change in centripetal force is

#### Explanation:

The centripetal force is

The kinetic energy is

The variation of kinetic energy is

The mass is

The radius of the track is

The variation of centripetal force is