1. Sir Isaac Newton and the Universal Force of Gravity All objects exert a force of attraction upon other objects depending on their size and the distance separating them.

2. Q. Who is this Newton dude any way? gravitational constant = 6.67300 × 10-11 m3 kg-1 s-2 A. Legend says in 1687 he was taking a break under an apple tree and noticed that the apples fell to the ground. He wondered why does the moon go around the earth? Why didn't the moon Fall? Or clouds? This is a Grave situation lets call this force Gravity. Boy, he was a deep thinker!

3. Q. That Law of Universal Gravitation is weird! What does it mean? A. Everything has gravity. It's a Force. It exerts a Pull. All Matter has this force from the tiniest atom to the biggest galaxy. All Matter is attracted to other matter. How strong gravity is depends on 2 things: –T–The Mass ( the amount of matter) the more mass the stronger the gravity. –T–The Distance separating the objects the closer they are the stronger the gravity.

4. Okay okay! So now we know all about gravity. So What! What's the point!! Q. What can gravity do? A. Here are a few things that gravity can do. A Black Hole's gravity: Holds galaxies together. The Sun's gravity: Keeps the earth in orbit giving us winter and summer etc.

5. The Earth's Gravity: Keeps your feet on the ground. Helps make paper airplanes fly. Holds the atmosphere down so you can breathe. Makes Bungie jumping and roller coasters really cool. Helps you to do tricks on a skate board or those little finger boards (which I hate).

6. The Moon's gravity: Keeps the earth spinning which gives us day and night. Makes the oceans have tides. Makes children very excitable at school during a full Moon.

7. Q. Cool! How do I measure it? A. Easy! You use weight. Q. That's the same as mass Right? A. Nope!!! Although sometimes we use then interchangeably on earth. PlaceGravityYour MassYour Weight Earth60Kg (132lbs) 60 Newtons Moon6x less than Earth 60 Kg10 Newtons

8. How much do you weigh on Jupiter, or Mars Or the Sun? http://www.exploratorium.edu/ro nh/weight/ http://www.exploratorium.edu/ro nh/weight/ Mass Your mass is how much of you there is. Weight Your weight is how hard gravity is pulling on your mass. It depends where you are.

9. This is a scale. It measures weight. How hard gravity is pulling down on the object you are weighing. Usually it is measured in Newtons.

10. This is a Balance it measures Mass. It compares an object to a Known Mass. When they balance they have the same mass. Usually it is measured in Grams.