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?
Here, the centripetal force is from the tracks keeping the train in a circle.
Finding the velocity from the frequency
Newtons second law
Using the equation for centripetal acceleration
Finding the difference in force
Substituting in values
Which is about