Gravity is an invisible force that pulls
everything towards the earth. No matter how hard an object is thrown
it starts to come back down to earth. This is an example of gravity
at work. Gravity pulls everything down with the same force. It
doesn't matter how heavy or how light the object is. It is the same
for all objects.
Gravity also pulls matter together. The bigger an
object is or the greater its mass, there will be more force of
gravity. Gravity helps keep the planets orbiting around the sun.
Pulled by gravity, a ski jumper races down a steep chute into the air. The skier's high speed carries him forward as he drops, making a long jump.
It also holds the hot gases in the sun. This is important because we get our heat, light, and energy from the sun. All box cars use gravity as their source of power.
by Chad, Melissa, and Matthew