Physics - NLM Question with Solution | TestHub

For (A) : $\mathrm{F}=50\mathrm{N}$, for no slipping $f_r=350N>f_m=150N.$

So ${\mathrm{f}}_{\mathrm{k}}=120\mathrm{N}$ up the plane.

For (B) : $\mathrm{F}=150\mathrm{N}$, for no slipping $f_r=250N>150N.$

So ${\mathrm{f}}_{\mathrm{k}}=120\mathrm{N}$ up the plane.

For (C) : $\mathrm{F}=250\mathrm{N}$, for no slipping $f_r=150N=f_m=150N.$

So ${\mathrm{f}}_{\mathrm{R}}=150\mathrm{N}$ up the plane.

For (D) : $\mathrm{F}=350\mathrm{N}$, for no slipping $f_r=50N<f_m=150N$

So ${\mathrm{f}}_{\mathrm{R}}=50\mathrm{N}$ up the plane.