# A model train with a mass of #4 kg# is moving along a track at #8 (cm)/s#. If the curvature of the track changes from a radius of #54 cm# to #27 cm#, by how much must the centripetal force applied by the tracks change?

##### 1 Answer

Mar 4, 2017

#### Explanation:

Firstly let's just put everything in SI units - change the

Now, the equation for centripetal force is

where

In this case, the radius is changing, so we can say that

Putting in the values that we know,