A model train, with a mass of #4 kg#, is moving on a circular track with a radius of #8 m#. If the train's kinetic energy changes from #32 j# to #0 j#, by how much will the centripetal force applied by the tracks change by?

1 Answer
Apr 17, 2016

Answer:

#8N#

Explanation:

Centripetal force is given as #F_c = (mv^2)/r = ("2 K.E.")/r#.

Hence, #Delta F_c = (2 Delta"K.E.")/r = (2*(32-0) J)/(8m) = 8 N#