### 1. Everyone has to learn about gravity sometime!

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

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

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

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

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

### 7. So gravity is a great equalizer.

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

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

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

### 11. Which are a distance "r" apart

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

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

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

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

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

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

### 18. And "G" is the gravitational constant.

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

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

### 21. It is a very accurate theory of gravity.

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

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

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

### 25. Gravitational Potential Energy is Eg = mgh.

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

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

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

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

### 30. Marines now know about gravitational potential energy!

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

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

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

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

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

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

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

### 38. So keep it up, guys...

### 39. You're gonna nail it someday!

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