1. Day 45 In Honors Physics
1) You remember that you are actually in physics class
2) We remind ourselves of all that gravity stuff a
3)Orbits
4) Charges

2. REMINDER SO FAR

6. Is the mass of the Earth or the meteor needed in this case?
A) Nope, it does not change values in this situation
B) Nope, we can just use any number we want for it
C) Yes, we need it to calculate the actual value

7. What will happen to the force between the Earth and the Meteor here?
A) It gets larger since they get closer, so there is more attraction
B) It gets smaller since they get closer, there is less attraction

8. Lets solve:

9. What did we do?
We RELATED the equation to the amounts things changed by

10. Now to Orbits:
Look here
Idea: At slow speeds, the ball will simply fall back and hit Earth.
Idea: At the ORBITAL VELOCITY at that height, the ball will have a CIRCULAR orbit
Idea: At a velocity HIGHER than the ORBITAL VELOCITY but less than the ESCAPE VELOCITY, the ball has an ELLIPTICAL orbit
Idea: At higher velocities, it escapes Earths ‘Gravity Well’

11. AND THE MAJOR LINK
In each case, the ball is ‘falling’ towards Earth due to the gravitational pull.
But at too high speeds, the downward pull is not enough to overcome its inertia tangental

12. The Idea of Charges
The beginnings of the ideas of atomic interactions, charges, and the nucleus

13. Remind me about Atoms…

18. In Reality Our model: Electron clouds of uncertainty
Tiny nucleus (still uncertain boundries)

20. For example
An atom has a nucleus of 20 protons, 10 neutrons, and has 17 electrons orbiting. What is its overall charge?

21. For example
An atom has a nucleus of 20 protons, 10 neutrons, and has 17 electrons orbiting. How many COULUMBS is that?

22. For example
An atom has a nucleus of 20 protons, 10 neutrons, and has 17 electrons orbiting.
In nature, things want to be NEUTRAL.
How does this become neutral?

23. HOW TO NEUTRALIZE In this case… it’s a net POSITIVE.
Ideas: Can gain electrons or lose protons.
But there is a MAJOR flaw here…

25. HOW TO NEUTRALIZE What did you notice?
What would happen if rubbing him took electrons?

26. GROUNDING
Grounding means making neutral by being exposed to Earth through a conductor.
If a positive charge is connected…
If a negative charge is connected…

27. If the amount of charge is conserved, that means in any situation, the total amount of charge in a system….
If a charge is FUNDAMENTAL, then is it possible to have a fraction of that amount?

30. Key ideas: Fundamental charges are 1.6x10-19C and are + or –
Nature wants to be neutral, and splits things evenly