Answer: 32 N.
- A 12 N
- B 32 N
- C 40 N
- D 50 N
Correct answer: B. 32 N
Explanation: Max friction on A: f = 0.4 x 3 x 10 = 12 N. Max a for A = 4 m/s<sup>2.</sup> Max F = (3+5) x 4 = 32 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.