A block of mass M is placed on a rough floor of a lift. The coefficient of friction between the block and the floor is μ μ . When the lift falls freely, the block is pulled horizontally on the floor. What will be the force of friction
Text Solution
Verified by ExpertsThe correct answer is:
D
When the lift moves down ward with acceleration 'a' then effective acceleration due to gravity
g' = g – a
[As the lift falls freely, so a = g]
So force of friction 
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