Question

an action - reaction pair of forces exists between —
○ the wall and the swimmers hands
○ the swimmers feet and the wall
○ the swimmer and the pool floor
○ the swimmers hands and feet

Explanation:

Step1: Recall Newton's third law

Newton's third law states that for every action, there is an equal and opposite reaction.

Step2: Analyze each option

• Option 1: The wall and the swimmer's hands: There is no direct interaction shown in the image where the hands are pushing the wall.
• Option 2: The swimmer's feet and the wall: When the swimmer pushes off the wall with their feet (action force), the wall pushes back on the swimmer's feet (reaction force). This is an action - reaction pair.
• Option 3: The swimmer and the pool floor: There is no interaction between the swimmer and the pool floor in the context of the action shown (pushing off the wall).
• Option 4: The swimmer's hands and feet: These are parts of the same body and do not form an action - reaction pair as per Newton's third law (which requires interaction between two different objects).

Answer:

the swimmer's feet and the wall