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Forces and Friction

Forces and Friction

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Question 85

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 acceleration of the box is 0.60 ms−2^{-2}−2

a.

Find the coefficient of friction between the box and the floor.

Diagram for Question 8(a): A box of mass 12 kg sits on a horizontal floor. A force of 20 N is applied to the box at an angle of 25 degrees 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.

Diagram for Question 8(b): A box of mass 12 kg sits on a horizontal floor. A force of 20 N is applied to the box at an angle of 25 degrees below the horizontal, pushing it towards the box.

Explain why the acceleration of the box will now be less than 0.60 ms−2^{-2}−2.

[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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