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Laws of Motion
Newton's Third Law and Contact Force
1 question from 1 paper, each with its answer.
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- years asked, 2017–2026
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- of Laws of Motion
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Concepts tested
- Contact force between blocks pushed together
All Questions
2024 1 question
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A horizontal force 10 N is applied to a block A as shown in figure [add image]. 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:
Common acceleration $a = \frac{F}{m_A + m_B} = \frac{10}{2 + 3} = 2\ ms^{-2}$ Force exerted by A on B (normal reaction) $= m_B \times a = 3 \times 2 = 6$ N
