This video explains angular momentum and Rotational inertia by using everyday examples and visual experiments like spinning on a rotating stool. Angular momentum is conserved so the momentum before is the same as the momentum after. When a dancer is spinning with their arms stretched out, in order for her to spin faster and keep her momentum her speed must increase as she brings her arms into her chest. When the mass of an object is farther away from its axis, the rotational inertia increases making the rotation of the object slower, but when the mass is nearer to the axis the rotational inertia decreases making the object go faster.
Monday, January 14, 2013
Angular Momentum and Rotational Inertia
This video explains angular momentum and Rotational inertia by using everyday examples and visual experiments like spinning on a rotating stool. Angular momentum is conserved so the momentum before is the same as the momentum after. When a dancer is spinning with their arms stretched out, in order for her to spin faster and keep her momentum her speed must increase as she brings her arms into her chest. When the mass of an object is farther away from its axis, the rotational inertia increases making the rotation of the object slower, but when the mass is nearer to the axis the rotational inertia decreases making the object go faster.
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