Pgs. 277 - 304 Chapter 8 Rotational Equilibrium and Dynamics.

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Chapter 9 Objectives Calculate the torque created by a force.

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Chapter 8 Rotational Equilibrium and Dynamics

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pgs Chapter 8 Rotational Equilibrium and Dynamics

Objectives  Explain how moment of inertia affects rotational motion.  Calculate the moment of inertia of various real world objects.

Rotation & Inertia  Center of Mass – the point around which an object rotates if gravity is the only force acting on the object  Rotational and translational motion can be combined

Moment of Inertia (I)  Resistance of an object to changes in rotational motion  Dependent on the mass of the object and how that mass is situated around the axis of rotation  Units – kg m 2

Moment of Inertia

What is the moment of inertia for a merry-go-round that has a mass of 525 kg and a radius of 2.00 m?

What is the moment of inertia for a solid ball with a mass of 4.10 kg and a radius of m?

Newton’s 2 nd Law for Rotation

A potter’s wheel has a radius of 0.50 m and a mass of kg. If the wheel comes to a stop with an angular acceleration of rad/s 2, what torque was applied?