# L3_04.pptx - Rotation As you come in please set clicker to...

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• thisisbunk10
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As you come in, please set clicker to channel 44 and then answer the following question (before the lecture starts). Bug the Professor if he forgets to start the clicker software. Quiz – What is the linear velocity at the equator due to the spin of the Earth? Assume the Earth is a sphere with a radius of 6,400 km. A. 7.3×10 -4 rad/s B. 7.3×10 -4 m/s C. 0.47 m/s D. 470 m/s Rotation

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Topics for Today Rotational inertia (10-5) Torque (10-6) Newton’s second law for rotation (10-7) Work and rotational kinetic energy (10-8)
Inertia “is the resistance of any physical object to any change in its state of motion” (Wikipedia). An object at rest tends to stay at rest, an object in motion tends to remain in motion. For linear motion, the inertia of a body is determined by its mass. Since F = ma the mass determines how hard it is (how much force is needed) to change the velocity of an object. For rotation, we translate velocity to angular velocity and we translate mass to rotational inertia. Rotational inertia describes how hard it is to rotate an object. I = “Rotational inertia” = “moment of inertia” Rotational Inertia

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Rotational inertia Do demo 1Q10.10 - Inertial Wands. Get two volunteers to spin the two rods.
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