Class 11 Physics simulations · System of Particles and Rotational Motion

Conservation of angular momentum

Pull two rotating masses inward and watch the angular speed increase.

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What to notice

With no external torque, angular momentum stays fixed as the moment of inertia changes.

Key relation

I₁ω₁ = I₂ω₂

Try this

Halve the final radius while keeping the initial state unchanged.

What you can change

• Each point mass: 1 to 4 kg
• Initial radius: 1 to 2 m
• Current radius: 0.4 to 2 m
• Initial angular speed: 0.5 to 2 rad/s

More in System of Particles and Rotational Motion

• Centre of mass of three masses
• Moment of inertia of shapes
• Parallel-axis theorem
• A rod as a physical pendulum
• Rolling without slipping
• Rolling race: ring, disc, spheres
• Torque and rotation
• Topple or slide?

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