Angular Momentum Section 8.1 (Ewen et al. 2005) Objectives: Define and calculate moment of inertia. Define and calculate moment of inertia. Define and.

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Presentation transcript:

Angular Momentum Section 8.1 (Ewen et al. 2005) Objectives: Define and calculate moment of inertia. Define and calculate moment of inertia. Define and calculate angular momentum. Define and calculate angular momentum. Solve conservation of momentum problems. Solve conservation of momentum problems.

Moment of inertia (also, rotational inertia) – the property of a rotating body that causes it to continue to continue to turn until a torque causes its rotational motion to change. tTY&feature=related tTY&feature=related

Rotational Inertia of Some Regularly Shaped Objects

Rotational equivalent of Newton’s second law of motion, the law of acceleration.

Other Rotational Equivalents to Linear Motion Concepts Recall that momentum was inertia in motion or of the difficulty in bringing a moving body to rest. – Similarly, angular momentum for a rotating body about a fixed axis is defined as

Also recall that impulse is the change in linear momentum. – Angular impulse is the change in angular momentum.

Conservation of Angular Momentum Law of conservation of angular momentum – the angular momentum of a system remains the same unless an external torque acts on it.