Rotational Motion & Particles Sytstem

"Quiz Challenge: Let's See What You Know!"

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Question 1

What is the SI unit of angular displacement?

  • Radian

  • Meter

  • Degree

  • Joule

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Question 2

What is the angular velocity of an object moving in a circular path with a constant speed?

  • Zero

  • Constant

  • Increasing

  • Decreasing

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Question 3

If the moment of inertia of a rotating object is increased, what happens to its rotational kinetic energy, assuming the angular velocity remains constant?

  • It increases

  • It decreases

  • It remains the same

  • It becomes zero

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Question 4

Which of the following is true about the center of mass of a system of particles?

  • The centre of mass is always at the geometric centre of the object

  • The centre of mass always lies inside the object

  • The centre of mass is the point where the total mass of the system can be considered to be concentrated

  • The centre of mass moves with uniform velocity in a circular path

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Question 5

Which of the following describes the rotational equivalent of Newton's second law?

  • τ=Iα

  • F=ma

  • ω=v/r

  • L=Iv

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Question 6

If a particle is moving in a circle of radius r with a constant speed, what is the direction of its acceleration?

  • Tangential to the circle

  • Radial and inward

  • Radial and outward

  • Perpendicular to the velocity

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Question 7

Which of the following conditions is necessary for a system of particles to be in equilibrium?

  • The sum of the external forces must be zero

  • The sum of the external torques must be zero

  • The sum of the internal forces must be zero

  • Both A and B

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Question 8

Which of the following is the unit of moment of inertia in the SI system?

  • kg·m

  • kg·m²

  • N·m

  • N·m²

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Question 9

What happens to the angular velocity of a rotating object if its moment of inertia is increased while the applied torque remains constant?

  • The angular velocity increases

  • The angular velocity decreases

  • The angular velocity remains the same

  • The object stops rotating

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Question 10

What is the term used for the rotational equivalent of linear velocity in rotational motion?

  • Angular velocity

  • Angular acceleration

  • Linear acceleration

  • Angular displacement

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Physics

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