Wednesday, December 23, 2009

What is gravity? What physical porperty of an object is the main determintation of its gravity?

The gravitational field of an object is based on its mass. Don't confuse this with weight. We would weigh different amounts on different bodies because of the different gravitational fields. For example, the gravitational field of the moon is roughly 1/6 that of the earth's so we would weigh about 1/6 as much on the moon as we do here on earth.





Distance also affects the gravitational field. The closer you are to something the stronger the effect of gravity. In fact the force of gravity is proportional to the square of the distance between the objects. So if you triple the distance between 2 objects, their gravitational pull on each other weakens 3虏 = 9 times.What is gravity? What physical porperty of an object is the main determintation of its gravity?
Gravity is a field, a mathematical law that describes how a mass in the field would respond.





Mass creates gravity, and gravity causes mass to move.

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