Question

Find the force exerted by $3\text{kg}$ body on $1\text{kg}$ assuming all surfaces are smooth ($g=10{\text{m/s}}^2$)

• A. $30\text{N}$
• B. $20\text{N}$
• C. $8\text{N}$
• D. $2\text{N}$

Answer 1

The correct option is A $30\text{N}$

Since the surfaces do not have friction, there is no force acting on $3\text{kg}$ body in horizontal direction.
Hence,

$N=3g=3\times 10=30\text{N}$