1. November 8
AP Physics

2. Each group presents their problem
Homework:
25, 26,27,28
Each group presents their problem

3. In:
If the moon has a mass of  × 1022 kg, an orbital speed of km/s an orbital radius of km, What is the gravitational force of the earth moon system?

4. Objective: To find out about the law of universal gravitation.
Success criteria:
You will be able to solve universal gravitational problems.

5. Newton’s Law of Universal Gravitation

7. Newton’s Law of Universal Gravitation:

9. Problem:
Oscar (mass=65kg) and Olivia (mass=45 kg) sit 2 meters apart in physics class. What is the force of gravitational attraction between them? Does this cause them to drift toward each other?

10. Gravitational force is a vector

11. Anything that spreads out from a point source
Inverse square laws
Anything that spreads out from a point source
Gravitational force
Electrical force
Sound intensity
Light intensity
Radiation intensity

12. Inverse square law - gravitation

13. Inverse square law – light intensity

14. Light intensity

15. Inverse square law - radiation

17. Inverse square law – electric force

18. Sound spreads out as an inverse square

19. For the rest of class: 1-Gravitational problem set
2-Lab: centripetal force
Finish the calculations
Analysis
Conclusion due at the end of class.

20. Out:
If the distance between two point particles is doubled, then the gravitational force between them:
Decreases by a factor of 4
Decreases by a factor of 2
Increases by a factor of 2
Increases by a factor of 4
Cannot be determined without knowing the masses.

21. A rubber stopper goes in a circle with a string of radius 2 meters
A rubber stopper goes in a circle with a string of radius 2 meters. The string is inclined at 40o from vertical. The stopper has a mass of .3 kg. The string has a tension of 10 N. How fast is the stopper going?