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 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 ?

1. A

392N

2. B

294N

3. C

196N

4. D

490N

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### Solution:

$\begin{array}{l}\mathrm{m}=100\mathrm{kg};\mathrm{\mu }=0.4\\ \mathrm{F}=\mathrm{\mu N}=\mathrm{\mu mg}=0.4×100×9.8\\ \mathrm{F}=392\mathrm{N}\end{array}$

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