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Asked by golfwang to Charlotte, Dhvanil, Frank, Jim, Leila on 13 Mar 2013.
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Dhvanil Karia answered on 13 Mar 2013:
Gravity is a force that exist between any two things that have mass. For this force to be felt/observed mass of one of the objects needs to be very very large. If you drop a ball, it falls down because it is attracted towards the object called earth which has a mass of 6 x 10^24 kgs
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Charlotte Kemp answered on 13 Mar 2013:
Gravity is the force that any mass exerts on us pulling us towards its centre. The bigger the mass is, then the larger the force is. So, we all have a gravity, but our mass is so small that no-one else is able to feel it! As the mass of the moon is seven times smaller than the earth, when astronauts are on the moon they weigh seven times lighter than they do on earth!
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Leila Nichol answered on 13 Mar 2013:
Gravity is the pull of the earth. On earth the graviational pull is 9.8m/s^2, but this varies planet to planet, and there is no gravity in outer space! When you skydive and jump out of a plane you accelerate towards the earth due to your weight and gravity the product of this is the fastest you will fall, at your terminal velocity. Gravity is what keeps out feet on the ground (and not flying around like astronauts!), and what brings our face to the ground when we trip up!
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