1. Newton’s Law of Gravitation Conservation of Energy

2. Energy – 3 basic types : Kinetic Potential Radiative Energy of motion Stored energy Energy carried by light

3. Thermal Energy Randomized kinetic energy of many particles Temperature measures the average kinetic energy of the particles Lowest possible temperature

4. Gravitational Potential Energy Because all masses attract each other High potential energy Low potential energy Low kinetic energy High kinetic energy High potential energy Low kinetic energy Low potential energy High kinetic and thermal energy

5. Mass Potential Energy (Mass – Energy Equivalence)

6. The Law of Conservation of Energy Energy is never created or destroyed – it only changes form

7. The Universal Law of Gravitation 1.All masses attract all other masses through a force called gravity.

8. The Universal Law of Gravitation 1.All masses attract all other masses through a force called gravity. 2.The strength of the gravitational force is directly proportional to the product of the two masses.

9. The Universal Law of Gravitation 1.All masses attract all other masses through a force called gravity. 2.The strength of the gravitational force is directly proportional to the product of the two masses. 3.The strength of the gravitational force goes down as the square of the distance between their centers.

10. The Universal Law of Gravitation

11. If the Moon were to be moved to twice its current distance from Earth, what would happen to the force of gravity Earth exerts on the Moon? A) It would be 4 times stronger B) It would be 2 times stronger C) It wouldn’t change D) It would be 2 times weaker E) It would be 4 times weaker

12. Example: What gravitational force does the Earth exert on the Moon?

15. Example: What gravitational force does the Moon exert on the Earth?

16. Newton’s Third Law of Motion When object 1 exerts a force on object 2, object 2 exerts the SAME force on object 1, but in the opposite direction Sometimes called “Action – Reaction”

17. Example: What is the Moon’s acceleration due to the Earth’s gravity?

18. Example: What force does the Earth exert on 10 kg mass on the surface of the Earth?

19. Why do all objects on earth fall with the same acceleration?

20. Newton’s Second LawNewton’s Law of Gravitation Combining these two we find …

21. Why do all objects on earth fall with the same acceleration? Combining these two we find …

22. Example: Calculate the acceleration due to gravity on the surface of the Earth.

23. Example: Calculate the acceleration due to gravity on the surface of Europa, a moon of Jupiter.

24. Astro-Cash Cab! Jordyn McMaster-Neely Mariah Mondragon Colt Allred Connor Voelkel Nick Smith

25. 1) Newton's law of gravity is Can this be used to find the force between earth and you? If so, what is d? A.No B.Yes, d is the diameter of earth C.Yes, d is the distance from you to the ground D.Yes, d is the distance from you to the center of earth

26. 2) True or False ? Conservation of Energy says that if we don’t conserve energy now, we may not have enough later.

27. 3) If both the mass of the Earth and the diameter of the Earth were doubled, how would the acceleration due to gravity on the surface change? It would be four times greater. It would be two times greater. It would stay the same. It would be two times smaller. It would be four times smaller.

28. 4) When you stand in the sunshine on a clear summer day, you can actually feel the Sun’s warmth. Which general type of energy is it before it is converted to thermal energy in your skin?