Answer: = tan.
- A μ = sinθ
- B μ = cosθ
- C μ = 1/tanθ
- D μ = tanθ
Correct answer: D. μ = tanθ
Explanation: The angle of friction is defined so that the tangent of that angle equals the coefficient of friction: μ = tanθ.
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.