Question

A metal block of mass 10kg is dragged
on a horizontal rough road with a
constant speed of 5ms-1. If the
coefficient of friction between the block
and the road is 0.5, the rate at which heat
is generated in (Js-1) is​

Answer 1

Answer:

Mass of metal block, m = 10 kg

Coefficient of friction, c = 0.5

While the body is being dragged, friction opposes

the relative motion and does work against this movement. This work done by friction generates heat.

Rate at which heat is generated = Work done by friction / time

So Rate R = Force of friction × (displacement/time)

= cmg × v

= 0.5×10×10×5 = 250 J/s

Rate at which heat is generated = 250J/s