Rotation As you come in please set clicker

Topics for Today • Rotational inertia (10 -5) • Torque (10 -6) • Newton’s

Rotational Inertia • Here are the moments of inertia for some commonly used shapes.

Torque • You are using a wrench and trying to loosen a rusty nut.

Slides: 14

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Rotation 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 ↓

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)

Rotational Inertia •

Rotational Inertia PTC/CREO analysis

Rotational Inertia •

Rotational Inertia • Here are the moments of inertia for some commonly used shapes. • In all cases, the rotational inertia is linearly proportional to the mass and proportional to the square of the some dimension(s) of the object.

Rotational Inertia •

Torque •

Torque • You are using a wrench and trying to loosen a rusty nut. Which of the arrangements shown is most effective?

Newton’s • nd 2 Law for Rotation