When a person walks on the ground the work done by the friction force is zero
Answers
Answered by
1
Work done by the man is NOT zero. In fact, it is finite. Allow me to explain this. Work done by the man against gravity is zero. But that does not mean work done by man on block is zero. The block moves horizontally, hence it has a horizontal force to begin with. This is the force of Friction. This is where EVERYONE is wrong.
W=x∗f This is the real work that the man does on the block. x here is the displacement and f is the value of frictional force. Take note that in case man accelerates at a very high rate, the block falls. This is also because of friction. f≤μ∗Mg as the normal reaction at the surface, N=Mg.
Similar questions