Answer:
When a horse
pulls a cart, the force exerted by horse on the cart is always equal and
opposite to the force exerted by cart on the horse. So, at first glance it
seems that the forces being equal and opposite cancel each other out and hence,
the cart would not move.
It is the fact that
the cart moves.
Then the
question arises why does the cart move? This is possible only when the horse is
able to apply enough force to overcome the frictional forces.
Thus, to
make the cart move, the horse bends forward and pushes the ground backward with
its feet. When the forward reaction to the backward push of the horse is
greater than the opposing frictional forces between tyres of cart and ground,
the cart moves.
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