Question

A continuously increasing horizontal force (from zero) is applied on a block initially at rest on a horizontal surface. The initial slope of force applied vs friction graph is

• A. 0.5
• B. 1
• C. $\mu$
• D. $\frac{\mu }{2}$

Answer 1

The correct option is B 1

Initially friction force is equal to applied force parallel to surface


Initially, f = F

After F > $\mu$N, F will increase but
f will remain $\mu N$


Slope = ${\tan }^{-1}45=1$