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Chapter 9 Rotational Dynamics. 9.5 Rotational Work and Energy.

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Presentation on theme: "Chapter 9 Rotational Dynamics. 9.5 Rotational Work and Energy."— Presentation transcript:

1 Chapter 9 Rotational Dynamics

2 9.5 Rotational Work and Energy

3 DEFINITION OF ROTATIONAL WORK The rotational work done by a constant torque in turning an object through an angle is Requirement: The angle must be expressed in radians. SI Unit of Rotational Work: joule (J)

4 9.5 Rotational Work and Energy

5 DEFINITION OF ROTATIONAL KINETIC ENERGY The rotational kinetic energy of a rigid rotating object is Requirement: The angular speed must be expressed in rad/s. SI Unit of Rotational Kinetic Energy: joule (J)

6 9.5 Rotational Work and Energy Example 13 Rolling Cylinders A thin-walled hollow cylinder (mass = m h, radius = r h ) and a solid cylinder (mass = m s, radius = r s ) start from rest at the top of an incline. Determine which cylinder has the greatest translational speed upon reaching the bottom.

7 9.5 Rotational Work and Energy ENERGY CONSERVATION

8 9.5 Rotational Work and Energy The cylinder with the smaller moment of inertia will have a greater final translational speed.


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