State and explain universal law of gravitation ? What is its importance
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Newton's Apple
You've probably heard this story before: one day Isaac Newton was sitting under an apple tree when one of the apples fell from the tree and hit him on the head. This fortunate event was what led Newton to discover gravity, and the rest is history!
This is known as Newton's law of universal gravitation. What this means is that for any two objects in the universe, the gravity between these two objects depends only on their mass and distance.
We can also express this relationship in equation form: F = G * (m1*m2) /d^2
Gravity Gets Weaker with Distance
The distance between two objects is an important component of the law of universal gravitation. It's not just how far away the objects are from each other, it's the SQUARE of that distance. So, for example, if two objects are 3 kilometers away from each other, you can't just divide by 3 to get the gravitational force - you have to divide by 3 x 3, which is 9.
You've probably heard this story before: one day Isaac Newton was sitting under an apple tree when one of the apples fell from the tree and hit him on the head. This fortunate event was what led Newton to discover gravity, and the rest is history!
This is known as Newton's law of universal gravitation. What this means is that for any two objects in the universe, the gravity between these two objects depends only on their mass and distance.
We can also express this relationship in equation form: F = G * (m1*m2) /d^2
Gravity Gets Weaker with Distance
The distance between two objects is an important component of the law of universal gravitation. It's not just how far away the objects are from each other, it's the SQUARE of that distance. So, for example, if two objects are 3 kilometers away from each other, you can't just divide by 3 to get the gravitational force - you have to divide by 3 x 3, which is 9.
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According to the Universal law of gravitation: Every body in this universe attracts every another body with the force that is inversely proportional to the product of their masses and directly proportional to the square of the distance between them.
Importance of universal law of gravitation is that explain the motion of planets around the sun; the motion of moon around the earth; and the motion of artificial satellites around the Earth. It also explain the phenomena of rainfall, snowfall, and flow of water in rivers on the earth.
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