A-level · Forces & Newton's laws

FrictionExam-style questions

Friction as a force opposing motion, with magnitude up to a maximum F ≤ μR (and F = μR at the point of slipping) — on rough horizontal surfaces and slopes, the angle of friction tanα = μ, and F = ma with friction included.

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29 questions · A-level level · mark scheme and worked solution on each · no sign-up to try

DifficultyAll Level 2 Level 3 Level 4 Level 5

1
The block of mass $4$ kg ( $\mu = 0.3$ ) on a rough horizontal surface is now pushed by a horizontal force of $20$ N. Find its acceleration, to 3 s.f. ( $g = 9.8$ .)
Level 3 · 2 marksTry it
2
A particle is on the point of sliding down a rough slope inclined at $20^\circ$ . Find the coefficient of friction, to 3 s.f.
Level 3 · 2 marksTry it
3
A block of mass $4$ kg on a rough horizontal surface ( $\mu = 0.25$ ) is pushed by a horizontal force of $30$ N and slides.

Find the acceleration of the block. (4 marks)
Level 3 · 4 marksTry it
4
A crate of mass $3$ kg is dragged across a rough horizontal floor ( $\mu = 0.6$ ) at constant speed by a horizontal rope.

Find the tension in the rope. (3 marks)
Level 3 · 3 marksTry it