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Forces and Friction

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Question 59

A box of mass 12 kg, is pulled along a rough horizontal floor by a force of 20 N at an angle of 25∘ 25^\circ\,25∘ to the horizontal. The box is modelled as a particle and the coefficient of friction between the box and the floor is kkk, where 0<k<0.160<k<0.160<k<0.16.

a.

Find the acceleration of the block in terms of kkk.

A box of mass 12 kg sits on a horizontal floor, with a 20 N force acting at 25° above the horizontal.

[6]
b.

The box is now being pushed along the same floor by a force at an angle of 25∘ 25^\circ\,25∘ to the horizontal.

A 12 kg box is pushed by a 20 N force directed 25° below the horizontal toward the box on a rough horizontal floor.

Explain why the acceleration of the box will now be less than the acceleration in part (a).

[2]
Markscheme

Forces and Friction Questions

  1. A Level
  2. /Maths
  3. /Forces and Friction

108 exam-style questions on Edexcel A Level Maths Forces and Friction, covering 5.1 Resolving Forces, 5.2 Inclined Planes, and 5.3 Friction. Each one has a worked solution and a mark scheme showing where the marks go.

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