1. Section 2: Centripetal Force

2. Warm Up: 1)Define Force: 2) Define Acceleration: The acceleration is always in the direction………

3. Centripetal Force: Force required to keep an object in circular motion.

4. Centripetal Force Discovery: What direction is the centripetal force in? What happens to the force as the angular speed increases? What happens to the force as the Radius increase? What happens to the force if the tangential velocity stays the same and radius decreases?

5. Centripetal Force Properties: 1) Centripetal Force Direction: 2) If the Tangential Speed increases the centripetal force will: 3) If the Angular Speed increases the centripetal force will: 4) If the radius decreases and the velocity stays constant the centripetal force will: 5) Which will have the greatest centripetal force

6. Which has the greatest centripetal force Two candies are placed on a spinning table, which one will have the greatest centripetal force.

7. Demo: 1)Water Bucket

8. Demo: Flame

9. Demo: Penny and Hanger Wet towel

10. Technology Applications RacetrackSteel wire in tires and treads: everything but chains are good on ice Engine blade and design

11. Centripetal Force Derivation Newton 2 nd Law: F = mxa For Centripetal Force “F c ” F c =mxa c where a c – centripetal Acceleration a c =V t 2 /r

12. Centripetal Force Equation Sample Problem 1: A 8kg weight is spun at 3m/s at a radius of 1 meter before being thrown. Find the following. a)Centripetal Acceleration b) Centripetal Force

13. Sample Problem 2: Find the normal force at the following locations if the cart has a mass of 10kg: