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Long answer·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 crate is pulled 10 m10\text{ m} on a horizontal floor by a 50 N50\text{ N} force making 37∘37^\circ above the horizontal. Friction on the crate is 20 N20\text{ N}. Take cos⁡37∘=0.8\cos37^\circ=0.8.
Total: 4 marks

(a) Find the work done by the pulling force. (1 mark)

(b) Find the work done by friction. (1 mark)

(c) Find the net work done on the crate. (1 mark)

(d) State the change in kinetic energy. (1 mark)

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cbse-physics-11.u4.t4-1.laq.004

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