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3.3 R: Forces and Newton's laws

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Question 35

In this question use g=9.8g = 9.8g=9.8 m s−2^{-2}−2.

Two blocks PPP, of mass 5 kg, and QQQ, of mass 3 kg, rest in contact with each other on a rough horizontal floor.

A horizontal force of magnitude 40 N is applied to PPP, pushing both blocks along the floor. The coefficient of friction between each block and the floor is 0.2.

a.

Find the acceleration of the blocks.

[3]
b.

Find the magnitude of the force exerted by P P\,P on QQQ.

[3]
Markscheme

3.3 R: Forces and Newton's laws Questions

  1. A Level
  2. /Maths
  3. /3.3 R: Forces and Newton's laws

139 exam-style questions on AQA A Level Maths 3.3 R: Forces and Newton's laws, covering 3.3.1 Concept of a force and Newton's first law, 3.3.2 Newton's second law, 3.3.3 Weight and motion under gravity, 3.3.4 Newton's third law and equilibrium, 3.3.5 Addition of forces and resultants (A-level only), and 3.3.6 Friction (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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