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4.9 Forces and Newton's laws (A-level only)

4.9 Forces and Newton's laws (A-level only)

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Question 20

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

4.9 Forces and Newton's laws (A-level only) Questions

  1. A Level
  2. /Maths
  3. /4.9 Forces and Newton's laws (A-level only)

106 exam-style questions on WJEC A Level Maths 4.9 Forces and Newton's laws (A-level only), covering 4.9.1 Forces and Newton's laws (A-level only), 4.9.2 Forces and Newton's laws (A-level only), 4.9.3 Forces and Newton's laws (A-level only), 4.9.4 Forces and Newton's laws (A-level only), and 4.9.5 Forces and Newton's laws (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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