Question

4. Identify the forces that act according to Newton's third law of motion when
(i) a horse accelerates.
(ii) a swimmer swims at a constant speed.
first law?​

Answer 1

Answer:

(i) A horse accelerates.

(i) A horse accelerates.The force the horse exerts on the cart is of equal size and opposite direction to the force the cart exerts on the horse, by Newton's third law. (These two forces are an action-reaction pair.) As the horse exerts greater force, both horse and cart move, accelerating from zero to some velocity.

(ii) A swimmer swims at a constant speed.

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. Thus, swimmers must stroke downward in the water to stay afloat and propel forward. This movement is equal and opposite to the force the water exerts against the swimmer to stop them from moving.