A model train, with a mass of 3 kg, is moving on a circular track with a radius of 1 m. If the train's kinetic energy changes from 18 j to 27 j, by how much will the centripetal force applied by the tracks change by?

Feb 13, 2016

The change in centripetal force should be 18 N

Explanation:

we know KE =(1/2)XmassX(velocity)^2
intial KE being 18J then massX(initial vel)^2 =36 J
and initial centripetal force ={massX(initial vel)^2}/radius
= 36 N (radius = 1m)
similarly we
final centripetal force = 54 N
Hence change in force = 18 N