Answer: 0.5 m/s2.
- A 0.5 m/s2
- B 1 m/s2
- C 2 m/s2
- D 3 m/s2
Correct answer: A. 0.5 m/s2
Explanation: Total friction = mu(m1+m2)g = 0.25 x 6 x 10 = 15 N. Net force = 18 - 15 = 3 N. a = 3/6 = 0.5 m/s2.
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.