Topic: Static and kinetic friction, laws of friction, rolling friction· Laws of Motion

A horizontal force 10 N is applied to a block A 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 horizontal force 10 \(N\) is applied to a block \(A\) 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 :

blocks A (2 kg) and B (3 kg) pushed by F=10 N

1. 10 \(N\)

2. zero

3. 4 \(N\)

4. 6 \(N\)

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Answer: 4. 6 \(N\)

Key idea: Both blocks move together with the same acceleration. Find it first, then use it for block B.

\(a=\frac{F}{m_A+m_B}=\frac{10}{2+3}=2\) m/s\(^2\).
The only horizontal force on B is the push from A: \(N=m_Ba=3\times2=6\) N.

Option 4. (10 N is the force on A, not on B.)

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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A horizontal force 10 N is applied to a block A 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 :

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