1. Circular Motion

2. Yesterday
Motion in a circle at a constant speed gives you centripetal acceleration, and thus a centripetal force ac = v2 r Fc = m*v2

3. Today
What happens when the thing isn’t swinging in a flat circle, but is actually a pendulum
onicalPendulum.htm

4. Conical Pendulum
The important thing to resolve from a conical pendulum is the components of each force Fv FT Fc Fg

5. Try these problems
Section 8A #1 and 2

6. Banked Corners
A neaderthalic nascar driver goes around an icy corner with a radius of 15m in a 740kg car at 12 ms-1 . Find:
The weight force
The Centripetal force
A vector diagram
The road support force
The angle of the road

7. Banked Corners
A neaderthalic nascar driver goes around an icy corner with a radius of 15m in a 740kg car at 12 ms-1 . Find:
The weight force 7300N
The Centripetal force 7100N
A vector diagram See board
The road support force N
The angle of the road 44o
You should now be able to work through the questions in 8A

8. Vertical Circular Motion
When an object is moving at constant speed in a vertical circle there is a constant change in the force balance that it experiences
Reaction force due to
Centripetal acceleration
Force of Gravity

9. Vertical Circular Motion
At the top of the loop Fc and Fg cancel providing a moment of weightlessness
At the bottom of the loop Fc and Fg combine to give a moment of doubled force
Reaction force due to
Centripetal acceleration
Force of Gravity

10. Energy Conservation
With systems that convert kinetic energy into potential energy account must be taken for motion in a circle.
A good example of this would be a glider that performs a loop after a dive
Energy converts from: Potential. (1)
To kinetic. (2)
To circular kinetic. (3)
To kinetic. (4) 1 3 4 2