The horse pulling the wagon is able to move forward because of:
Correct answer: B. The force exerted by the ground on the horse
- A. The force exerted by the horse on the ground
- B. The force exerted by the ground on the horse
- C. The force exerted by the wagon on the horse
- D. The force exerted by the horse on the wagon
Explanation
When the horse pulls the wagon, it pushes the ground in the backward direction. Due to the third law of motion, the ground exerts a forward force which has the same magnitude. As the backward force applied by the wagon is weaker than the force applied by the horse, the wagon moves in the forward direction. As per Newton's third law of motion, when a horse pulls a wagon, the force that causes the horse to move forward is the force the ground exerts on it.
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