1. Uniform Circular Motion
Physics I Class 12
Uniform Circular Motion

2. Newton’s Second Law - Yet Another Review!

3. Uniform Circular Motion

4. Acceleration in Circular Motion
When an object travels in a circle, its velocity is constantly changing (in direction at least).
That means the object has a non-zero acceleration even if it moves at constant speed.

5. Important Facts About Velocity and Acceleration Vectors

6. What is the Direction of Acceleration?

7. “Centripetal Force” “Centrifugal Force”

8. Example: A Rock on a String
Twirl a 1 kg rock attached to a string in a 1 m radius vertical circle. The speed is 4 m/sec. What forces act on the rock and what are the directions of those forces?

9. Using Newton’s Second Law to Solve Problems - Review

10. Case A: Rock at the Top of the Circle

11. Case B: Rock at the Bottom of the Circle

12. Normal Force - A Concept We Will Use in Today’s Activity

13. Class #12 Take-Away Concepts

14. Class #12 Problems of the Day

15. Class #12 Problems of the Day

16. Activity #12 Ferris Wheel Thrill Ride

17. Class #12 Optional Material “Centrifugal” Force?

18. Accelerated Frames of Reference

19. The Inertial Forces

20. Discussion Swinging a Water Bucket Overhead