PhysicsA wooden block of 100 kg is about to be pushed on a floor of coefficient of friction 0.4. What is the magnitude of the force of friction on the wooden block when it is just pushed ?

A wooden block of 100 kg is about to be pushed on a floor of coefficient of friction 0.4. What is the magnitude of the force of friction on the wooden block when it is just pushed ?

A
392N
B
294N
C
196N
D
490N

Solution:

$\begin{array}{l} m = 100 kg; μ = 0.4 \\ F = μN = μmg = 0.4 \times 100 \times 9.8 \\ F = 392 N \end{array}$

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