Question

Elizabeth is pushing against a wall as she stretches before exercising as shown below.



The wall pushes back against Elizabeth's hands with the same force in the opposite direction. Which of Newton's laws does this best demonstrate?
A.
Newton's second law of motion
B.
Newton's universal law of gravitation
C.
Newton's third law of motion
D.
Newton's first law of motion

Answer 1

C. Newton's third law of motion.

Explanation: When Elizabeth pushes the wall, the wall exerts an equal and opposite force on her hands — an action–reaction pair. This is the statement of Newton's third law.