PHYS 1080 Lecture Notes - Lecture 3: Centripetal Force, Resultant Force, Kinetic Energy
23 Mar 2016
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Document Summary
Energy can be transferred from one form to another, but the total energy of the system is conserved. Change in k equals total work done on object. When your height changes, you have a change in potential energy. A body moves in a circle at a uniform constant speed. The velocity is tangent to the circle. Has direction towards the centre of circular path ac = v2 / r. Period (t) time to travel circumference. Frequency revolutions per second (s-1 or hz) Radians unit of measure of angular" distance in direction. Velocity is found by: v = d / t = 2 r / t. Relationship between v and w: v = w r (w= lowercase omega) Another expression for centripetal acceleration is: ac = v2 / r = (wr)2 / r. Force directed radially inward on an object moving in a circular path. Note: the source of the centripetal force could be gravity, tension or friction.
