Question

Arrangement of two block system is as shown. The net force acting on $1\, kg$ and $2\, kg$ blocks are (assuming the surfaces to be frictionless) respectively

• A. 4 N , 8 N
• B. 1 N , 2 N
• C. 2 N , 4 N
• D. 3 N , 6 N

Answer 1

Answer: (C)

acceleration of the system $=\frac{F_{\text {ext }}}{M_{\text {Total }}}$
$=\frac{6}{3}=2\, m / s ^{2}$

for $2 kg$ block
$N=2(2)=4\, N$

for $1\, kg$ block
$F_{\text {net }}=6-4=2\, N$