# A model train with a mass of #9 kg# is moving along a track at #18 (cm)/s#. If the curvature of the track changes from a radius of #32 cm# to #45 cm#, by how much must the centripetal force applied by the tracks change?

##### 1 Answer

Apr 17, 2016

#### Explanation:

Centripetal (center-seeking) force is given by the equation

where

At the beginning, when the radius is

In the second part, when the radius has expanded to

The change in centripetal force is then found by simple subtraction,