# A model train, with a mass of #8 kg#, is moving on a circular track with a radius of #1 m#. If the train's rate of revolution changes from #5/8 Hz# to #5/4 Hz#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Mar 4, 2017

#### Explanation:

The centripetal force of an object is given by

You can also find

where

Substitute this into the above equation,

or, since we're looking at the *change* in centripetal force from the *change* in frequency, then

where

Therefore, using the values that we know,