Answer: Both A and B.
- A Force x time
- B Energy / velocity
- C Both A and B
- D Force x distance
Correct answer: C. Both A and B
Explanation: Momentum = mv = kg m/s. Force x time = N x s = kg m/s<sup>2</sup> x s = kg m/s. Energy/velocity = J/(m/s) = kg m/s. Both match.
Free-body diagram of a block on an incline: weight (mg) resolves into mg sinθ along the slope and mg cosθ into the slope, balanced by the normal force N and friction f.
Concept context
Newton's three laws, friction, circular motion, and free body diagrams.