Multiple choice

When a cart is pulled by a horse, the force that causes the horse to move forward is _____.

  1. the force that the horse exerts on the ground

  2. the force that the cart exerts on the horse

  3. the force that the ground exerts on the horse

  4. the force that the horse exerts on the cart
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to Newton's third law, when the horse pushes backward against the ground, the ground exerts an equal and opposite forward force on the horse. This reaction force is what actually propels the horse forward.

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