Question
Question: The upper half of an inclined plane with inclination φ is perfectly smooth. While the lower half is ...
The upper half of an inclined plane with inclination φ is perfectly smooth. While the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by
A
2 sin φ
B
2 cosφ
C
2 tan φ
D
tan φ
Answer
2 tan φ
Explanation
Solution
mgs sin φ = μmg cos φ s/2 or μ = 2 tna φ.