Rotational Motion – Stage 2 (Page 1)

Board Exam Questions – Short Answer Type

This section covers short answer questions frequently asked in Intermediate and Board examinations. Answers are written in a scoring-friendly format.

Q1. What is rotational motion?

Rotational motion is the motion of a body in which all its particles move in circular paths about a fixed axis.

Example: Rotation of a ceiling fan, rotating wheel.

Q2. Define angular displacement.

Angular displacement is the angle through which a body rotates about a fixed axis.

SI unit: radian

Q3. What is angular velocity?

Angular velocity is defined as the rate of change of angular displacement with respect to time.

ω = dθ / dt

Q4. Define angular acceleration.

Angular acceleration is the rate of change of angular velocity with respect to time.

α = dω / dt

Q5. Define torque.

Torque is the turning effect of a force about a fixed axis or point.

τ = r × F

Q6. What is moment of inertia?

Moment of inertia of a body about an axis is the sum of the products of the masses of its particles and the squares of their distances from the axis of rotation.

I = Σ mᵢ rᵢ²

Q7. State the SI unit of moment of inertia.

The SI unit of moment of inertia is kg m².

Q8. What is radius of gyration?

Radius of gyration is the distance from the axis of rotation at which the entire mass of the body may be assumed to be concentrated without altering its moment of inertia.

I = Mk²

Q9. State the parallel axis theorem.

The moment of inertia of a body about any axis is equal to the moment of inertia about a parallel axis passing through the center of mass plus Md².

I = I_cm + Md²

Q10. What is the condition for pure rolling?

For pure rolling without slipping, the linear velocity of the center of mass is equal to the product of angular velocity and radius.

v = ωR

Next: Stage 2 – Page 2
Very Short Questions + Reasoning Type

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