Physics - NLM Question with Solution | TestHub

While the block moves with the sledge, static friction supplies the block's horizontal acceleration: f = mA, with N = mg.

Sliding begins when the required friction reaches its limiting value:

$$\mathrm{mA}={\mathrm{f}}_{\max }={\mu }_{\mathrm{s}}\mathrm{mg}$$

Using the angle of friction, ${\mu }_s$ = tan$\phi$:

$${\mathrm{A}}_{\min }={\mu }_{\mathrm{s}}\mathrm{g}=\mathrm{g}\tan \phi$$

Correct option: (1).