Question 14
FrictionFor a rough inclined plane on which lies a body of weight W, the angle θ in the diagram above becomes the angle of friction if
- A.tan θ = coefficient of static friction
- B.cos θ = coefficient of dynamic friction
- C.sin θ = coefficient of sliding friction
- D.sec θ = limiting frictional force
Show the answer and explanation
Answer: A (tan θ = coefficient of static friction)
Explanation
When the body is just about to slide, W sin θ = μW cos θ, so μ = tan θ. That angle is called the angle of friction.