Ground reaction force and foot force are described as having what relationship?

Ground reaction force and foot force are described as having what relationship?

• A. Equal magnitude and opposite direction
• B. Same direction and different magnitude
• C. Different magnitude and same direction
• D. No relationship

Answer: (C)

Newton's third law says forces come in action–reaction pairs that are equal in magnitude and opposite in direction. In foot–ground contact, the force the foot applies to the ground is matched by the ground’s force on the foot with the same size but opposite direction. So the ground reaction force acting on the body and the force the foot exerts on the ground are equal in magnitude and opposite in direction. The other descriptions would violate this action–reaction relationship.

Newton's third law says forces come in action–reaction pairs that are equal in magnitude and opposite in direction. In foot–ground contact, the force the foot applies to the ground is matched by the ground’s force on the foot with the same size but opposite direction. So the ground reaction force acting on the body and the force the foot exerts on the ground are equal in magnitude and opposite in direction. The other descriptions would violate this action–reaction relationship.