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
A child sits to the left of the pivot of a seesaw. A child sits to the right. The seesaw is balanced and its own weight is negligible.
Total: 3 marks
(a) Find the distance of the child from the pivot. (1 mark)
(b) Find the upward reaction at the pivot. (1 mark)
(c) State why balancing torques alone is not enough to find the pivot reaction. (1 mark)
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