Solution 9.4
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(New page: Image:9.4.gif As the block is moving relative to the surface the friction force must satisfy <math>F = \mu R</math> Also as the block has conmstant velocity the forces on it must be...)
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Revision as of 11:04, 17 May 2010
As the block is moving relative to the surface the friction force must satisfy
\displaystyle F = \mu R
Also as the block has conmstant velocity the forces on it must be in equilibrium.
Resolving horisontally,
\displaystyle \begin{align} & \to :\quad 20\ \text{N}-F=0 \\ & \\ & F=20\ \text{N} \\ \end{align}
Resolving vertically,
\displaystyle \uparrow :\quad R-mg=0
\displaystyle R=mg=4\times 9.81=39.24\ \text{N}
