Question

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

• A. $4\text{N},8\text{N}$
• B. $1\text{N},2\text{N}$
• C. $2\text{N},4\text{N}$
• D. $3\text{N},6\text{N}$

Answer 1

The correct option is C $2\text{N},4\text{N}$

Acceleration of the system $=\frac{F_{\text{ext}}}{M_{\text{Total}}}$
$=\frac{6}{3}=2{\text{m/s}}^2$
For $2\text{kg}$ block

$Fnet=ma$
$\text{N}=2\left(2\right)=4\text{N}$

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