Physics 111: Elementary Mechanics – Lecture 10 Carsten Denker NJIT Physics Department Center for Solar–Terrestrial Research.

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Presentation transcript:

Physics 111: Elementary Mechanics – Lecture 10 Carsten Denker NJIT Physics Department Center for Solar–Terrestrial Research

November 7, 2006Center for Solar-Terrestrial Research Parallel-Axis Theorem Let h be the perpendicular distance between the given axis and a parallel axis through the center of mass. If I com is the rotational inertia of the body about the parallel axis that extends through the body’s center of mass, then the rotational inertia I about the given axis is

November 7, 2006Center for Solar-Terrestrial Research Torque Line of Action Moment Arm The ability of a force to rotate a body depends not only on its tangential component, but also on just how far from the pivot point the force is applied. The unit of the torque  is Nm! Do no use J!

November 7, 2006Center for Solar-Terrestrial Research Newton’s 2 nd Law for Rotation Radian measure Proof

November 7, 2006Center for Solar-Terrestrial Research Work and Rotational Kinetic Energy Work–kinetic energy theorem Work (rotation about fixed axis) Work (constant torque) Power (rotation about fixed axis)