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# Gravity

Gravity. What makes the world go ‘round…. Review: Newton’s 3 rd Law. Properties of Gravity. Every object with mass has gravity… = gravity. Properties of Gravity. The larger an object is, the more gravity it has…. Bigger Gravity =. Properties of Gravity.

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## Gravity

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1. Gravity What makes the world go ‘round…

2. Review: Newton’s 3rd Law

3. Properties of Gravity • Every object with mass has gravity… = gravity

4. Properties of Gravity • The larger an object is, the more gravity it has…. Bigger Gravity =

5. Properties of Gravity • As objects get farther away, the force of gravity gets weaker… Gravity ,

6. Newton’s Law of Gravitation • Newton discovered how mass, distance and gravity were all related…

7. Newton’s Law of Gravitation • Newton’s Law States the FORCE of gravity is:

8. Fg Fg is the force of gravity pulling any two objects toward each other from any distance.

9. Newton’s Law of Gravitation G (gravitational constant) = m1 & m2 = mass of any two objects d = distance between the two objects.

10. Examples • Take a look at the first example on your notes sheet…

11. Another Look at Newton’s Law • Newton’s Law of Gravitation is an inverse square law… • Inverse Square Law: As d increases, Fg gets exponentially smaller. The variable in the denominator is squared.

12. What an inverse square looks like • Making a graph of Fg vs. Distance would look like this: Fg Distance

13. Back to the classwork… • From the classworksheet, divide the distance of #1 by the distance of #2. Ratio of distances: = ? • What do you notice?

14. Back to the classwork… • Divide the answer for Fg you got for #1 by the answer you got for #2. Ratio of gravitational force: = ? • What do you notice?

15. Using this relationship… • With an inverse square law, you can solve some problems using this chart, once you know Fg at one place…

16. What it looks like • You find Fg from some starting point using Newton’s Law… d Fg=1000N

17. What it looks like • When you double the distance (x2), the force gets divided by 22, or 4.… d d Fg=1000N/4=250N

18. What it looks like • When you triple the distance (x3), the force gets divided by 32, or 9.… And so on and so on…. d d d Fg=1000N/9=111N

19. Finishing Up… • Complete #3 and #4 on your classwork sheet.

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