1. Warm Up: Page 30 6 Steps that led Newton to being considered the “MAN”
Step1—Understand Galileo’s concept of Inertia.
Any change in speed or direction requires a force.
Step 2—Sit under apple tree and see the apple falling; see moon through trees.
Step 3—Realize that the moon must be falling
towards the earth, just like the apple!
Step 4—Wonder why moon circles Earth.
Step 5—Conclude that a centripetal force must be pulling the moon into circular motion.
Step 6—Figure out that the moon falls for the same reason that the apple falls—both are pulled by EARTH’S GRAVITY.

2. Announcements Newton’s Law Warm-Ups and Work Page 28
Scavenger Hunt Page 29
Universal Gravitation Notes Page 30
Notebook Check tomorrow
Open Notebook Assessment
Homework Due tomorrow
Fruit Sale

3. Free Fall Place thumb over hole and fill cup
What will happen if you remove your thumb?
Write down predication
Results?
Place thumb back on the hole
If you dropped the whole cup, would the water fall through the whole?
Stand on top of a chair
Prediction?

4. Weight and Gravity Quick write 2 minutes, Page 30:
Why didn’t any of the water fall out?

5. Newton and Gravity
Newton thinks, hmm why isn’t any water falling out of the cup?
There must be no net force between the cup and the water, that’s why the water stays inside?
However there is a force because it falls out if the cup is kept still.

6. Tennis Ball and a Sheet of Paper
Which will hit the ground first? Why?

7. Brain Pop!
rcesandtime/gravity/

8. 2nd Law and Gravity Which law tells us about force?
Newton’s 2nd Law: F=ma
If water is falling out of the cup, then there must be a force
If there is a force, there must be acceleration
But wait, how can there be a force if the cup is not moving?
That acceleration just from being there! Gravity!

9. About Weight
Weight is a measurement of how hard gravity is pulling on that object.
Your weight depends on how much gravity is acting on you at the moment
You'd weigh less on the moon than on Earth, and in interstellar space you'd weigh almost nothing at all.

10. This is NOT a new formula…
Gravitational Force = Weight
So if
then
where g = 9.8m/s2 and m = mass
F = ma
Weight = mg

11. GP: Making Weight (10)
Background: have you ever jumped up and down on a scale, what happens to your weight Objective: See how changing acceleration can add or take weight away Materials: (1) spring scale/group (2) Weight, anything you can find

12. IP: Fly Me to the Moon (15)

13. UNIVERSAL GRAVITATION
Newton’s Genius

14. How Universal Gravitation relates to Newton’s First Law…
The moon will remain in motion in a straight line if it were not acted upon by an outside force (the Earth’s gravity pulling on it).

15. Newton’s Hypothesis…
He hypothesized that the moon was simply a projectile circling the Earth under the attraction of gravity.

16. Newton’s Law of Universal Gravitation
Newton did not discover gravity.
Newton discovered that gravity is universal.
Question: How can we increase the force of gravity between two objects?

17. Center of Mass Demonstrations
Move three foot lengths away from the wall. Keeping your legs straight bend down until your head touches the wall. Grab a chair and try to stand up
Males versus females
meeJU&feature=related

18. Challenge: Can you catch a $1 bill
Can you catch a $1 bill before it hits the floor using only your index finger and middle finger?
Rules
Arm out perpendicular, and hand straight out
Place thumb, index and middle fingers 1” apart
You must only move those three fingers
If you catch it, you keep it!

19. Why Can’t you Catch it?
Place reasons on board

20. Key Take Aways What is the acceleration due to gravity on Earth?
Why doesn’t the water fall out of the cup when dropped?
Why do all objects on Earth fall at the same acceleration?