Question

How many external forces would appear to act on $(m_2+m_3)$ if they are considered as a system and $m_1$ is considered as another system in the figure shown?

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

The correct option is D $4$


Gravitational force is a universal force and always acts on all masses. Normal reaction acts at all contacts and tension in the string will act away from the body

Since the two masses are considered as single mass therefore only one normal reaction is shown.