Laws Of Motion Question 52
Question: A block of mass 0.1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the wall is 0.5, the magnitude of the frictional force acting on the block is [IIT 1994]
Options:
A) 2.5 N
B)0.98 N
C) 4.9 N
D) 0.49 N
Show Answer
Answer:
Correct Answer: B
Solution:
Limiting friction $ F _{l}={{\mu } _{s}}R=0.5\times (5)=2.5\ N $
Since downward force is less than limiting friction, the block is at rest, so the static force of friction will act on it.
$ F _{s} $ = downward force = Weight$ =0.1\times 9.8=0.98 $ N
BETA
