Long answer·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
Use the friction graph shown.
Total: 5 marks
(a) Find the friction force when the applied force is . (1 mark)
(b) Find the limiting static friction. (1 mark)
(c) Find the friction force when the body is sliding. (1 mark)
(d) Explain why part (a) is not equal to the limiting friction. (2 marks)
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