The horse drives the cart According to Newton’s third law, the force with which the horse acts on the cart is equal to the force with which the cart acts on the horse. Why does the cart follow the horse, and not vice versa?
Consideration should be given to the forces acting on the horse and cart from the ground. The horse pushes off the ground, that is, the forward friction force of rest acts on the horse from the ground. It is this force that gives the horse with the cart speed at the beginning of the movement and balances the forces of resistance to movement in the future.
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