FRQ — System of Particles and Rotational Motion

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

Two point masses,

2\text{ kg}

0.50\text{ m}

and

1\text{ kg}

1.0\text{ m}

, are fixed to a light rod rotating about an axis through one end. A constant torque of

3\text{ N m}

acts on the system from rest for

4\text{ s}

Total: 3 marks

(a) Find the total moment of inertia. (1 mark)

(b) Find the angular acceleration. (1 mark)

Your response (optional — you can also work on paper)

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