Answer: 150 N.
- A 50 N
- B 100 N
- C 150 N
- D 200 N
Correct answer: C. 150 N
Explanation: fk = mu_k x mg = 0.2 x 50 x 10 = 100 N. F = fk + ma = 100 + 50 x 1 = 150 N.
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.