# March 1 & 4 - PowerPoint PPT Presentation

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March 1 & 4. Action: Earth pulls moon. - What is the reaction ? - What is stronger – action, reaction , or same? - What Law defends your answer?. Action: Earth pulls moon. What is stronger – action, reaction, or same?. Action(Earth pulls moon) Reaction (moon pulls Earth)

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March 1 & 4

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### March 1 & 4

Action: Earth pulls moon. - What is the reaction?- What is stronger – action, reaction, or same?- What Law defends your answer?

### Action: Earth pulls moon.What is stronger – action, reaction, or same?

• Action(Earth pulls moon)

• Reaction (moon pulls Earth)

• Same!

• 1st Law

• 2nd Law

• 3rd Law

• PHET Gravity and orbits

• Run the simulation and complete the Lab Activity Sheet.

• This is due in 30 MINUTES for a grade – you will (10 points based on completion)

• Then, we will have a graded, individual, 30 point POST LAB to assess this lab activity.

### #1 –Why did Newton think there must be a force acting on the moon?

• It moved in a straight line, not a circle

• It moved in a circle, not a straight line

### #2 What did Newton conclude about the force that pulls apples to the ground and the force that holds the moon orbit?

• They were different forces

• They were the same force

### #3 If the moon falls, why doesn’t it get closer to Earth?

• It has a large tangential speed, so it falls around Earth and not into it

• It has a small tangential speed, so it falls around Earth and not into it

### #4

• What is meant by tangential speed?

• Popcorn…

### #5

• How did Newton check his hypothesis that there is an attractive force between Earth and moon?

• Popcorn…

### #6

• What is required before a hypothesis can become a theory?

• Popcorn…

### #6

• What is required before a hypothesis can become a theory?

• Popcorn…

### #7 Since there is gravity between the planets and the sun, why don’t the planets crash into the sun?

• They have small tangential speeds, so they fall around sun and not into it

• They have large tangential speeds, so they fall around sun and not into it

### How would these gravity forces change if the Sun got more massive?

• Increase

• Decrease

• Stay the same

### How would these gravity forces change if the Earth was much closer to the Sun?

• Increase

• Decrease

• Stay the same

### How would these gravity forces change if the Earth got much less massive?

• Increase

• Decrease

• Stay the same

### How would these gravity forces change if the Earth and Sun were moved farther apart?

• Increase

• Decrease

• Stay the same

### Changes to make to your post lab:

• Make sure #2 and 4 say massive

• Change the answer choices in #11 to “enjoyable” rather than “useful”

• When you are done… Place in in box upside down; RETURN CLICKER IN ORDER; silently BEGIN your HW