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3.3 R: Forces and Newton's laws

3.3 R: Forces and Newton's laws

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Question 29

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

A box of mass 12 kg is pulled along a rough horizontal floor by a force of magnitude 20 N acting at an angle of 25° 25°\,25° above the horizontal. The box is modelled as a particle and the coefficient of friction between the box and the floor is 0.1.

a.

Find the acceleration of the box.

Figure for question 8

[5]
b.

The box is now pushed along the same floor by a force of magnitude 20 N acting at an angle of 25° 25°\,25° below the horizontal. Explain why the acceleration of the box will now be less than the acceleration in part (a).

Figure for question 8

[2]
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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