Graph Between Applied Force And The Force Of Friction - Practice Questions & MCQ

At A static friction is maximum

OA = Represents static friction

Beyond A, the force of friction decreases slightly

2.    

The angle between the normal reaction and resultant contact force is called the angle of friction(Ө).

$\begin{aligned} & \tan \theta=\frac{F_l}{R} \\ & \tan \theta=\mu_s \\ & \frac{F_l}{R}=\mu_s \\ & \mathrm{R}=\text { Reaction, } \\ & F_l=\text { Force of limiting friction } \\ & \theta=\tan ^{-1}\left(\mu_s\right)\end{aligned}$

3.  

$
\begin{aligned}
& S=\sqrt{F^2+R^2} \\
& S=\sqrt{(\mu m g)^2+(m g)^2} \\
& S=m g \sqrt{\mu^2+1} \\
& S=\text { Resultant force } \\
& \mu=\text { Coefficient of friction }
\end{aligned}
$

If $\mu=0, \mathrm{~S}$ (will be minimum), $\therefore \mathrm{S}=\mathrm{mg}$