A horse pulls on a chariot but the brake is on and it does not move. The reaction force to the force of the chariot acting on the horse is:

Question

A horse pulls on a chariot but the brake is on and it does not move. The reaction force to the force of the chariot acting on the horse is:

BlackTom AI · Accepted Answer

To analyze the situation, we must apply Newton's third law, which states that every action has an equal and opposite reaction.

Option a: The frictional force acting on the chariot. This is not the reaction to the chariot’s force on the horse; friction on the chariot is a separate contact force with the ground and is not the direct reaction pair to the horse-chariot interaction.

Option b: The force of the chariot acting on the ground. This describes a different interaction (the chariot pushing the ground) and is not the reaction to the force the chariot exerts on the horse.

Option c: The force of the horse acting on the ground. While the horse does push on the ground as part of its locomotion, this is not the action-reaction pair for the force exerted by the chariot on the horse.

Option d: The force of the horse acting on the chariot. This is the correct action–reaction pair: the chariot exerts a force on the horse, and the horse simultaneously exerts an equal and opposite force on the chariot. In this setup, since the brake is on and the system doesn’t move, the internal interaction between horse and chariot is described by this same pair of forces, without requiring motion for the pair to exist.

A horse pulls on a chariot but the brake is on and it does not move. The reaction force to the force of the chariot acting on the horse is:

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