Question

A horizontal force 10 N is applied to a block 4 as shown in figure. The mass of blocks A and B are 2 kg and 3 kg, respectively. The blocks slide over a frictionless surface. The force exerted by block A on block B is:

• A. Zero
• B. $4N$
• C. $6N$
• D. $10N$

Answer 1

Answer: (C)

$6N$

Answer 2

The total acceleration of the system is:
$a = \frac{F}{m_A + m_B} = \frac{10}{2 + 3} = 2 \, m/s^2$.
The force exerted by A on B is:
$F_{AB} = m_B \cdot a = 3 \times 2 = 6 \, N$.