1. Circular Motion Centri____ Force

2. Frequency vs. Period Period (T)- The time it takes for one full rotation or revolution of an object in seconds. Frequency (f)- The number or rotations or revolutions per unit time, measured in Hertz (Hz)

3. How do we get this equation? Tangential Speed

4. Centripetal Force F c A force of some kind is required to maintain circular motion. Why? A force of some kind is required to maintain circular motion. Why? Any force that causes an object to follow a circular path is called a centripetal force. Any force that causes an object to follow a circular path is called a centripetal force. Centripetal means “center-seeking” Centripetal means “center-seeking” Always acts inwards Always acts inwards

5. Centripetal Acceleration a c Tangential Velocity Radius

6. Centripetal Force

7. Examples Friction is the centripetal force acting on a car driving around a curve. Friction is the centripetal force acting on a car driving around a curve. Gravity is the centripetal force causing the moon to orbit the Earth. Gravity is the centripetal force causing the moon to orbit the Earth. Centripetal force is not a new type of force. It is just the name given when a force causes circular motion by acting at a right angle to an object’s motion. Centripetal force is not a new type of force. It is just the name given when a force causes circular motion by acting at a right angle to an object’s motion.

8. A ball is attached to a string and is spinning in a circle. The string breaks. Why does it fly off at a tangent? Because NO FORCE acts upon it! Because NO FORCE acts upon it! Centrifugal force is a fictitious force. It is an effect of rotation. Centrifugal force is a fictitious force. It is an effect of rotation. How might centrifugal force replace gravity? How might centrifugal force replace gravity?