Chapter_8.ppt - Chapter 8 Rotational Motion and Equilibrium...

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Chapter 8 Rotational Motion and Equilibrium
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Units of Chapter 8 Rigid Bodies, Translations, and Rotations Torque, Equilibrium, and Stability Rotational Dynamics Rotational Work and Kinetic Energy Angular Momentum
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8.1 Rigid Bodies, Translations, and Rotations A rigid body is an object or a system of particles in which the distances between particles are fixed (remain constant). In other words, a rigid body must be solid (but not all solid bodies are rigid). Raise your hand if you can think of solid body that is not rigid.
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8.1 Rigid Bodies, Translations, and Rotations A rigid body may have translational motion, rotational motion, or a combination. It may roll with or without slipping.
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8.1 Rigid Bodies, Translations, and Rotations For an object that is rolling without slipping,
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8.2 Torque, Equilibrium, and Stability It takes a force to start an object rotating; that force is more effective the farther it is from the axis of rotation , and the closer it is to being perpendicular to the line to that axis.
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8.2 Torque, Equilibrium, and Stability The perpendicular distance from the line of force to the axis of rotation is called the lever arm. The product of the force and the lever arm is called the torque.
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8.2 Torque, Equilibrium, and Stability Torque is a vector (it produces an angular acceleration), and its direction is along the axis of rotation, with the sign given by the right-hand rule.
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From Walmart’s website… no one has ever been this happy to change a tire, don’t be fooled… 8.2 Using Torque
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8.2 Torque, Equilibrium, and Stability
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