1. Circular Motion

2. Copy the following chart in your jounals.
Demo
What is going in circle?
Touching
Direction of F causing circular motion
Cause

3. Gravitron
Motorcycle merry-go-round
Kick ball in circle
Cage of death
Balloon demo
Earth and Sun
What’s touching the object? What direction is the force? What force is causing circular motion?

4. #3 = before
#5 = after motorcycle
#10 after kick ball
#15 after cage
After balloon, verbally ask “What is the direction of force causing the circular motion?”

5. Centrifugal force center fleeing
Centripetal force center seeking

6. Centrifugal force center fleeing
Not a real thing
Centripetal force center seeking
The technical name for a force causing circular motion.

7. Centripetal force is not in its self a “kind” of force, it is the name given to another “real”force. That causes circular motion.
Ex. Tension, force due to gravity, applied force, normal force, friction

8. Your turn.
A demo will be assigned to your group, your task is to
Describe how to do the demo.
Identify what object is going in a circle.
Describe what is touching the object.
Identify the direction of the centripetal force.
Identify the source of the centripetal force.

9. Jobs:
Demonstrator (do the demo)
Scribe (write in your journal, others will read it)
Presenter (verbal explanation)
Media expert (show people what you do in class)

10. How to do a GOOD presentation
Do the demo (demonstrator).
Must include answers to all 5 categories from chart (presenter).
Practice ahead of time so you don’t end up saying “umm” “ahhh” “like”
Indicate you are finished presenting by asking if there are any questions.

11. What is the direction of force causing the circular motion?