1. Warm Up What is the tension in a 2.75 m cord that whirls a 5.6 kg object in a circular path at a speed of 4.83 m/s?

2. Warm Up What is the tension in a 2.75 m cord that whirls a 5.6 kg object in a circular path at a speed of 4.83 m/s? F = mv 2 = (5.6 kg)(4.83m/s) 2 = 47.5 N r 2.75 m

3. Physics Ch. 10 Center of Gravity

4. Start with a silly activity…. What happens when you try to touch your toes and have your back and heels against a wall??

5. Center of Gravity The average position of weight. Center of Mass Average position of matter.

6. If you attempt to balance an L shaped object on its small end, what would happen? Why?

7. It would fall. Why? Because it was not supported at its average position of weight (CofG)

8. Stability Stable UnstableNeutral Equilibrium Equilibrium Equilibrium

9. Stability Stable Unstable Neutral Equilibrium Equilibrium Equilibrium Work must be done to raise CofG

10. Stability Stable Unstable Neutral Equilibrium Equilibrium Equilibrium Work must be CofG is lowered with done to raise CofG any displacement

11. Stability Stable Unstable Neutral Equilibrium Equilibrium Equilibrium Work must be CofG is lowered with Displacement will done to raise CofG any displacement neither raise nor lower CofG

12. Which block requires more work to tip over? Why?

13. I need a volunteer Sit in a chair at the front of class. Attempt to stand up without putting your feet under your chair (Your feet need to be out in front of you chair) What happens? Why?

14. Center of gravity in organisms with limbs is not located in a fixed position! It depends on orientation!

15. Next Now its time for Myth Busters: Circular Motion!!!