The Physics of Rotation

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Presentation transcript:

The Physics of Rotation We’re on a roll! The Physics of Rotation

Rotational Energy Chapter C9

Key Concepts … Rotating masses possess rotational energy An object can have both kinetic and rotational energy Moment of Inertia measures distribution of mass wrt CM Two identical mass objects can have very different moments of inertia Simple mathematical relationship links angular velocity to linear velocity as long as no skidding takes place

Two-minute Problems… C9T.1 C9T.4 C9T.8

What’s Rotational Energy It’s a natural extension of the concept of kinetic energy Angular velocity Moment of inertia

Going from the translational world to the rotational world… Radian measure

How fast should the billiard ball from last week’s experiment have moved? Just add a new type of energy term:

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