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Newton's Laws of Motion

Brief insight of Newton's laws of motion.

Any science student or follower of Sir Isaac Newton (1643-1727) would know that his 3 laws of motion were framework for the mechanics of science. Newton calculated that the force of the attraction (gravity) between 2 objects is equal to the mass of each object multiplied by a gravitational constant and divided by the square of the distance between the objects.

What it means is that larger masses exert the stronger attraction, a reason why apples fall toward the Earth's gravitational centre. But, the force of gravity is reduced by distance - a reason why the Moon doesn't rush toward Earth or other larger celestial body. However, the earth's mass is much greater than that of the objects upon it that the force of attraction is large.


Isaac Newton's famous apple fall is common knowledge. Have you read or heard about astronaut David Scott experiment, his test involving a feather and a hammer? This is very interesting as it relates to objects falling.  In the early 70s, 1971 I think, Apollo 15 astronaut David Scott tried to simultaneously drop a feather and a hammer on the Moon to show that they would reach the ground at the same time. This is in the absence of air resistance.

Apparently, Scott's same experiment can also be done on planet Earth, for example, with a ball instead of a hammer, but in a vacuum tube.

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