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Universe 102: Force of Gravity

Universe 102: Force of Gravity

Gravity or gravitational forces exist when one object attracts another. It means molecules of one object pulling on the molecules of molecules of another object. It's like the Earth pulling on you and keeping you on the ground. That's gravity at work. Every object in the universe that has mass has a gravitational force. Even you exert gravity. When you compare your mass to the mass of the Earth, your gravitational force isn't very impressive.

Earth’s Gravity

Obviously gravity is very important on Earth. Other planets also affect our world. Because of Moon's gravity makes the tides rise and fall. The Earth's gravity keeps our planet orbiting the Sun, just like the Sun's gravity pulls on our planet. When the earth spins and gravity pulls on the clouds, weather can be affected.

The Earth always has the same pull on every object. If you drop a piece of paper, or you drop a piano, they will fall at the same speed. It is the Earth's gravity and pull that make objects speed up when they are falling. The Earth constantly pulls and objects constantly accelerate.

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