Rotational Kinetic Energy

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Presentation transcript:

Rotational Kinetic Energy Section 10-10

Kinetic energy of an object rotating about a fixed axis

Work For a constant force: For a changing force: For rotation:

Work-Energy Theorem for body rotating about fixed axis The work done in rotating a body through an angle θ2 – θ1 is equal to the change in rotational kinetic energy of the body.

Example 10-18 – Rotating Rod A rod of mass M is pivoted on a frictionless hinge at one end. The rod is held at rest horizontally and then released. Determine the angular velocity of the rod when it reaches the vertical position, and the speed of the rod’s tip at this moment.