First slide

Kinetic friction

Question

A block of mass 20 kg is pushed with a horizontal force of 90N. If the coefficient of static and kinetic friction are 0.4 and 0.3, the frictional force acting on the block is (g =10ms^-2 )

Moderate

A

90N
B

80N
C

60N
D

30N

Solution

$f_{k} = μ_{k} N, N = mg$

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