Which of the following pair has same direction always ?
Correct answer: C. force, acceleration
- A. force, displacement
- B. force, velocity
- C. force, acceleration
- D. force, momentum
Explanation
Newton's second law gives F_net = ma, so the net force and acceleration have the same direction when the force is nonzero. Force and displacement, velocity, or momentum need not always point in the same direction. The likely mistake is choosing force and momentum, but an object can have momentum in one direction while a force changes its motion in another.
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About Newton's Laws of Motion
Newton’s laws explain inertia, the relation between net force and acceleration, and action-reaction pairs. Questions involve free-body diagrams, balanced and unbalanced forces, F = ma, force as the rate of change of momentum, and identifying genuine third-law pairs, which act on different bodies.
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