|Gravity keeps the Moon orbiting around the Earth instead of floating off into space. Gravity is a force between bits of matter, attracting every bit to every other bit. Gravity is the force that keeps your feet on the ground. One may not feel it, but gravity affects us all the time. When a ball is thrown up into the air, no matter how high it goes, it always comes back down. The gravitational force between the earth and the ball pulls the ball down to the ground. If there were no gravitational force the ball would keep going up and up. In fact, without gravity if one jumped, he would keep moving out of space.
Earthís gravity pulls on the Moon, the Moonís gravity pulls on the Earth, and those forces keep the Moon in orbit around earth. In the same way the Sunís gravity pulls on Earth and the other planets keeps them in their orbits around the Sun.
The power of the pull of gravity between objects depends on two things, how far apart the objects are and the mass of each object - that is, how much matter each object contains. Objects that are close together and objects that have lots of mass attract each other strongly. Things that are far apart and things with small mass attract only weakly.
If you were on the Moon, you could jump much higher than you can when you are on earth. One could jump high and slam-dunk a basketball as easily as a seven-foot tall basketball star. This is because, since the Moon is much smaller than the Earth and contains much less matter than Earth, its gravitational pull is weaker than Earthís. With gravity pulling more weakly, you can jump higher. A person would even weigh less on the moon- only about one sixth of what it weighs here on Earth.
Directions: Answer the following questions.