Gravity is a force, which means that it pulls on things. But the Earth isn’t the only thing which has gravity. In fact, everything in the universe, big or little, has its own pull because of gravity – even you.
Isaac Newton was one of the first scientists to figure out the rules of how gravity behaves. The story goes, he was sitting under an apple tree when one of the fruits fell off. As he saw the apple fall down to the ground, he started to wonder why it didn’t go up to the sky instead.
After lots of experiments, and some very clever thinking, he worked out that the force of gravity depends on how heavy objects are, and that the pull of gravity between objects gets smaller, the further apart they are. To see how gravity works in our universe, we’re going to take a journey, with a few stops along the way.
First off, we’ll go to the park and play a game of football. When you kick the football into the air, the Earth’s gravity pulls it back down. But that’s not the only thing that’s happening: the gravity of the football is also pulling on the Earth. The thing is, the Earth is very heavy – much heavier than the football – so it’s unaffected by the pull of the football, while the football itself is pulled back down to Earth.
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Explanation:
Gravity is a force, which means that it pulls on things. But the Earth isn’t the only thing which has gravity. In fact, everything in the universe, big or little, has its own pull because of gravity – even you.
Isaac Newton was one of the first scientists to figure out the rules of how gravity behaves. The story goes, he was sitting under an apple tree when one of the fruits fell off. As he saw the apple fall down to the ground, he started to wonder why it didn’t go up to the sky instead.
After lots of experiments, and some very clever thinking, he worked out that the force of gravity depends on how heavy objects are, and that the pull of gravity between objects gets smaller, the further apart they are. To see how gravity works in our universe, we’re going to take a journey, with a few stops along the way.
First off, we’ll go to the park and play a game of football. When you kick the football into the air, the Earth’s gravity pulls it back down. But that’s not the only thing that’s happening: the gravity of the football is also pulling on the Earth. The thing is, the Earth is very heavy – much heavier than the football – so it’s unaffected by the pull of the football, while the football itself is pulled back down to Earth.