- #1

Krushnaraj Pandya

Gold Member

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## Homework Statement

A metal block of mass 10 kg is dragged on a rough horizontal surface with a constant speed of 5 m/s. If the coefficient of kinetic friction between the block and the road is 0.4, then the rate of generation of heat is. take g=10 m/s^2?

## Homework Equations

F=ma

Frictional force=μN

## The Attempt at a Solution

So I thought, the heat generated is the lost kinetic energy per second (if we stop applying the force), so I calculated the time it takes for the block to reach 0 velocity, the retardation is (0.4 x 100)/10 from v=u+at I got time=5/4 seconds. the rate should be total KE/time but this is incorrect, can someone give an intuitive explanation on how to solve this? Thank you