2. CHAPTER 5 CIRCULAR MOTION AND GRAVITATION

3. Kinetics of Uniform Circular Motion An object moving in circular motion is in constant acceleration, even if it maintains its speed…it is changing direction…thus changing velocity! Centripetal or radial acceleration points towards the center of revolution. (a r ) a r = v 2 / r where v is tangential velocity.

4. Frequency and Period Frequency and period are inversely related. 1/f = T v t = 2  r/T See Example 5-1

5. Dynamics of Uniform Circular Motion Since centripetal acceleration points towards the center, the force causing the acceleration must also be pointed to the center. The term “centripetal force” is not a new force, but it is sometimes used to refer to the force causing centripetal acceleration. See examples 5-3 and 5-4

6. Homework Page 138questions 1-4 Page 138 problems 1-4