# 39 People Who Just Learned Gravity Is A Bitch

**Sir Isaac Newton would be proud.**

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1.
Everyone has to learn about gravity sometime!

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2.
Some people learn about it when they're young.

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3.
Some people learn about it when they're old.

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4.
This co-ed just learned that gravity causes you to accelerate at 9.8 meters per second squared.

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5.
This young man just learned that that is really fast!

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6.
This tree just taught this gentleman that all falling objects travel at 9.8 m/s squared, regardless of size.

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7.
So gravity is a great equalizer.

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8.
Sir Isaac Newton was the first to accurately describe how gravity works in 1690. This boy just figured it out in 2013.

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9.
Newton's gravitation equation is F = Gm1m2/r2.

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10.
Where "F" is the force due to gravity, between two masses.

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11.
Which are a distance "r" apart

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12.
"G" is the gravitational constant that will always be there.

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13.
This cat just learned that gravity is dependent on mass differential.

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14.
And the young man in the middle just learned the force of gravity is dependent on distance between objects.

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15.
Acceleration due to gravity on the surface of the earth is g = GM/r2.

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16.
Where "M" is the mass of the Earth.

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17.
And "r" is the radius of the Earth (or distance between the center of the Earth and you, standing on its surface).

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18.
And "G" is the gravitational constant.

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19.
These two making out just learned about gravitational acceleration!

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20.
Einstein’s theory of general relativity (GR) is Gμν = 8πG/c4 Tμν.

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21.
It is a very accurate theory of gravity.

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22.
Where "G" (without the subscripts) is the gravitational constant.

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23.
And "c" is the speed of light.

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24.
This young lady just learned that Einstein was right!

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25.
Gravitational Potential Energy is Eg = mgh.

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26.
Where "m" is mass of object...

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27.
..."g" is acceleration due to gravity...

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28.
..."Eg" is the amount of gravitational potential energy an object has when it is near the surface of the Earth...

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29.
...and "h" is height of object above the surface of Earth.

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30.
Marines now know about gravitational potential energy!

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31.
Large objects in the universe are also subject to gravitational acceleration: a = √(GMa0/r)

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32.
Where where "a" is the acceleration an object feels...

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33.
..."M" is the mass of a galaxy...

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34.
..."r" the distance between the object and the center of the galaxy...

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35.
...and "G" is the gravitational constant.

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36.
This cameraman does not appreciate the mass of the universe.

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37.
Sadly, none of these equations can determine the acceleration of gravity between two bros.

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38.
So keep it up, guys...

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39.
You're gonna nail it someday!

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