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Case study·Hard exam skill (4/5)·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 horizontal beam ABAB of length 2 m2\text{ m} has weight 100 N100\text{ N} acting at its centre. A 200 N200\text{ N} load is placed 0.50 m0.50\text{ m} from end AA. The beam is supported at AA and BB.
Total: 4 marks

(a) Write the vertical force-balance equation. (1 mark)

(b) Take moments about AA and find the reaction at BB. (1 mark)

(c) Find the reaction at AA. (1 mark)

(d) Explain why taking moments about AA is convenient. (1 mark)

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cbse-physics-11.u5.t5-2.case.005

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