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## Homework Statement

Hello. I've got three doubts I can't solve by myself: ¿which is the force a horse must make with its hoofs to start a movement forward, and what force is needed to slip?. And the third question is what is the diagram of forces in these two cases?.

## Homework Equations

Newton's laws, force of friction (f

_{e max}=μ

_{e}F

_{n}), normal force (F

_{n}), force of gravity (F

_{g}), and horse's applied force(F

_{h}).

## The Attempt at a Solution

I Know that two horizontal forces are involved: the force made by the horse, and the friction of the ground. But I really don't know how to apply Newton's third law, and explain whose are these two forces' reaction forces; and I don't know to argue when does the horse start movement, and when does slip.