# A model train, with a mass of #2 kg#, is moving on a circular track with a radius of #8 m#. If the train's rate of revolution changes from #1/2 Hz# to #2/5 Hz#, by how much will the centripetal force applied by the tracks change by?

##### 1 Answer

Feb 25, 2017

#### Answer:

#### Explanation:

Here, the centripetal force is from the tracks keeping the train in a circle.

**Finding the velocity from the frequency**

Similarly,

**Newtons second law**

**Using the equation for centripetal acceleration**

**Finding the difference in force**

**Substituting in values**

Which is about