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2.3 Forces and Newton's laws

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Question 47

A box of mass 12 kg is pulled along a rough horizontal floor by a force of 20 N acting at 25∘ 25^\circ\,25∘ above the horizontal. The coefficient of friction is 0.1. Take g=9.8g=9.8g=9.8 m s−2^{-2}−2.

a.

Find the acceleration of the box.

[6]
b.

The force is instead applied at 25∘ 25^\circ\,25∘ below the horizontal. Explain why the acceleration is then smaller.

[2]
Markscheme

2.3 Forces and Newton's laws Questions

  1. A Level
  2. /Maths
  3. /2.3 Forces and Newton's laws

136 exam-style questions on CCEA A Level Maths 2.3 Forces and Newton's laws, covering 2.3.1 Forces and Newton's laws, 2.3.2 Forces and Newton's laws, 2.3.3 Forces and Newton's laws, 2.3.4 Forces and Newton's laws, 2.3.5 Forces and Newton's laws, 2.3.6 Forces and Newton's laws, 2.3.7 Forces and Newton's laws, 2.3.8 Forces and Newton's laws, 2.3.9 Forces and Newton's laws, 2.3.10 Forces and Newton's laws, 2.3.11 Forces and Newton's laws, 2.3.12 Forces and Newton's laws, and 2.3 Forces and Newton's laws. Each one has a worked solution and a mark scheme showing where the marks go.

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