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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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**Gravity**What makes the world go ‘round…**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**• As objects get farther away, the force of gravity gets weaker… Gravity ,**Newton’s Law of Gravitation**• Newton discovered how mass, distance and gravity were all related…**Newton’s Law of Gravitation**• Newton’s Law States the FORCE of gravity is:**Fg**Fg is the force of gravity pulling any two objects toward each other from any distance.**Newton’s Law of Gravitation**G (gravitational constant) = m1 & m2 = mass of any two objects d = distance between the two objects.**Examples**• Take a look at the first example on your notes sheet…**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.**What an inverse square looks like**• Making a graph of Fg vs. Distance would look like this: Fg Distance**Back to the classwork…**• From the classworksheet, divide the distance of #1 by the distance of #2. Ratio of distances: = ? • What do you notice?**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?**Using this relationship…**• With an inverse square law, you can solve some problems using this chart, once you know Fg at one place…**What it looks like**• You find Fg from some starting point using Newton’s Law… d Fg=1000N**What it looks like**• When you double the distance (x2), the force gets divided by 22, or 4.… d d Fg=1000N/4=250N**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**Finishing Up…**• Complete #3 and #4 on your classwork sheet.

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