Physics - NLM Question with Solution | TestHub
Consider a cart being pulled by a horse with constant velocity. The horse exerts force on the cart. (The subscript indicate the force on the cart due to horse.). The first subscript denotes the body on which force acts and second due to which it acts.
Options:(select one or more)
Answer:
Solution:
Identify each force pair carefully (subscripts: force on first body due to second).
(A) For the horse+cart system, the only external horizontal forces come from the ground: (and friction). Correct.
(B) The horse moves with constant velocity, so the net force on the horse is zero: . Correct.
(C) (on cart by ground) and act on the same body (the cart); an action-reaction pair acts on different bodies, so these cannot be an action-reaction pair. Statement wrong.
(D) (on cart by horse) and (on horse by cart) act on different bodies and are equal and opposite - an action-reaction pair. Correct.
Hence correct statements are (A), (B), (D).
