Question

Find A block of mass m= 2 kg is accelerateing by a force F= 20N applied on a smooth light pulley as shown in Fig. If the coefficient of kinetic friction between the block and the surface is $\mu$= 0.3. find its acceleration.

Answer 1

R.E.F image

${\mu }_k=0.3$

$F=2T\Rightarrow T=10N$

$F_{max}=MN$

$=0.3\left(20\right)$

$=6N$

$(T-f)=ma$

$(10-6)=2a$

$a=2m/s^2$ Ans