Question 12
FrictionThe diagram above shows a wooden block just about to slide down an inclined plane whose inclination to the horizontal is α. The coefficient of frictional force between the block and the plane is
- A.sin α
- B.tan α
- C.cot α
- D.cos α.
Show the answer and explanation
Answer: B (tan α)
Explanation
On the point of sliding, friction μmg cos α balances mg sin α, so μ = sin α/cos α = tan α.