Topic: Demystifying the Misconception: "We are pulled down by gravity"

Introduction

Gravity is the reason things with mass or energy are attracted to each other. It is why apples fall toward the ground and planets orbit stars. Most commonly known misconception is that we are pulled down by gravity. In order to make it easier to understand gravity is oversimplified as a force that pulls us down.

Understanding Gravity

Imagine the surface of a trampoline. If there is nothing on it, it is flat. But if you stand on the trampoline, it stretches around your feet and creates a valley with you at the centre. If there is a ball on the trampoline, it would roll toward your feet.

Your mass stretched the trampoline, creating what is called a gravity well that the ball rolls into. This is very similar to how the gravity of a heavy object - like the Earth - pulls things like you and me toward it. The heavier you are, the steeper the sides of the trampoline well, which explains why sun has a much stronger gravity than earth.

This is how gravity works! It acts as a force that attracts two objects towards each other and in this case the earth's gravity pulls us towards its centre and not strictly "down".

Scientific Principle

Gravity is not just what keeps you glued to the surface with a constant acceleration of 9.8 m/s. It's what keeps the entire planet glued together. It's what keeps the Moon tethered to an orbit around the Earth. And the Earth in orbit around the Sun.

If gravity juststopped, that would be catastrophic enough. The Moon and every gravitationally bound body in the solar system would immediately fly off in a tangential straight line from their present orbital paths. Every rotating body would begin to disassociate and fly apart into a huge cloud of debris.

But if gravityreversed, this becomes even more spectacular. The equation for acceleration due to gravitational attraction is g = G*M/R^2, where g is the acceleration due to gravity, G is the universal gravitational constant, M is mass, and R is distance. This goesnegative.

Things don't just disassociate and fly off in straight lines, they'll actively accelerate in the opposite direction for three seconds.

The Moon disintegrates and turns into an enormous debris cloud. Every planet,every gravitationally bound bodyessentiallyexplodesbriefly. They shoot apart into diffuse gas clouds for three seconds at the present speed of their gravitational acceleration, plus rotational energy.

And then gravity turns back on again. All of those bodies that just disassociated and flew apart at the speed of their present gravitational acceleration now start to clump back together again, fast.

This gives us a clear idea that gravity of an object pulls another object towards its centre, in our case earths gravitational pull acts towards centre and not "down".

Debunking the misconception

Newton's Law of Universal Gravitation: Every particle of matter in the universe attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.

This law explains why we feel a pull towards the Earth's centre, which we perceive as "down".

If gravity only pulled us "down", people at the North Pole and the South Pole would be pulled in different directions.

However, people at both poles are pulled towards the Earth's centre, proving that gravity doesn't just pull us "down".

Hence we can conclude that gravity not just a force that pulls us "down", but a force that attracts two bodies towards each other.

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