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When you push a heavy object, it doesn’t move. Explain the reason in terms of net force.

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There are four forces acting on the heavy table. They are normal force (upwards), gravitational force (downwards), push and friction (opposite to push).

Let’s take

Normal force = N (- ve); Gravitational 

Force = W (downwards); Push = F1

Friction = F2 (- ve) [more]

∴ Net force in X – direction = Push – Friction = F1 – F2 = – ve

Net force in Y – direction = N – W = – ve

As the net force in Y – axis is more you are unable to move the heavy object.

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