1. Uniform Circular Motion Equations
Adapted for B.W. Physics by
Dick Heckathorn
15 September 2K + 6

2. Demonstrations
Rotating Bike Wheel
Rotating Ne-2 Lights
Accelerometer

3. Distance to travel circumference (C) = 2 π R
Time to travel circumference T
Velocity directed tangent to the circle

4. What is the radius vector doing?

5. R R R

6. What is the radius vector doing?
It is changing direction 360o in time T
What is the velocity vector doing?

7. v v v

8. What is the velocity vector doing?
It is changing direction 360o in time T
What is the acceleration vector doing?

9. a a a

10. What is velocity vector doing?
It is changing direction 360o in time T
What is acceleration vector doing?
It is changing direction o in time T

11. Since ‘v’ is changing 360o in time T And ‘a’ is also changing 360o
in time T , then

12. v a v a R R v a R

13. 1
v R T 2
v T a 3
v R a 4
R T a

14. Direction of Vectors Each vector has its own particular direction
There is no rules for these vector directions as there was for multiplying a scalar quantity times a vector quantity.
You must remember to draw them or describe their direction from memory

16. Specifications Diameter 6 m (20 ft) Weight 1125 Kg (2475 pounds)
Axis spindle wheel hub diameter 33 cm 13 inches
Maximum Revolutions per second 30
Maximum tangential velocity m/s
Maximum sustained ‘g’ force
Maximum sustained centripetal force
Assuming 75 kg mass N
Remember kids, it’s a center seeking force
Maximum time until extreme Nausea (heaving) s

18. That’s All Folks