PHY 1010U Lecture Notes - Lecture 17: Rotational Energy, Acceleration, Angular Acceleration
Document Summary
A rolling object has both rotational kinetic energy as well as linear kinetic energy. Example: all 4 objects have same mass m and objects 1, 2, and 3 have same radii r. They slide down the incline starting from rest. Torque is the ability of a force to rotate an object. Opening a door for example depends on three factors: Distance r from the pivot to the point where f is applied. The torque depends on those three quantities. Is a vector defined as the cross product between the two vectors r and f. The units of torque are n. m r is the distance between the pivot point and the point on the object where the force is applied. r points away from the pivot. Is the angle between r and f measured counterclockwise, starting at r. A positive torque attempts to move the object counterclockwise (ccw). A negative torque attempts to move the object clockwise (cw).
