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12-1 Physics I Class 12 Uniform Circular Motion. 12-2 Newton’s Second Law - Yet Another Review!

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Presentation on theme: "12-1 Physics I Class 12 Uniform Circular Motion. 12-2 Newton’s Second Law - Yet Another Review!"— Presentation transcript:

1 12-1 Physics I Class 12 Uniform Circular Motion

2 12-2 Newton’s Second Law - Yet Another Review!

3 12-3 Uniform Circular Motion

4 12-4 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 12-5 Important Facts About Velocity and Acceleration Vectors

6 12-6 What is the Direction of Acceleration?

7 12-7 “Centripetal Force” “Centrifugal Force”

8 12-8 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 12-9 Using Newton’s Second Law to Solve Problems - Review

10 12-10 Case A: Rock at the Top of the Circle

11 12-11 Case B: Rock at the Bottom of the Circle

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

13 12-13 Class #12 Take-Away Concepts

14 12-14 Class #12 Problems of the Day

15 12-15 Class #12 Problems of the Day

16 12-16 Activity #12 Ferris Wheel Thrill Ride

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

18 12-18 Accelerated Frames of Reference

19 12-19 The Inertial Forces

20 12-20 Discussion Swinging a Water Bucket Overhead


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