A model train, with a mass of #4 kg#, is moving on a circular track with a radius of #15 m#. If the train's kinetic energy changes from #18 j# to #12 j#, by how much will the centripetal force applied by the tracks change by?
1 Answer
Mar 19, 2016
Change in force :
Explanation:
The key thing in this question is to determine the change in velocity because the centripetal force depends on velocity.
We can use the initial & final kinetic energies to determine initial and final velocities. And then determine the change in force.
(I'm actually going to take a shortcut and determine
Initial
Final
Change in force :