How does gravity help us?

Question

I need to know how the effects of gravity is beneficial to human beings.

Answer 1

For one, with Atmospheric Pressure. If Gravity instantly dissappeared, all the gas around Earth would dissapate and we would literally pop. Sixty miles of gaseous atmosphere weighs about 14.6 psi. Our body normally pushes back with 14.6 psi to regulate the pressure, which is why you don't feel anything. If all the pressure were instantly taken off, we would explode with the force of 14.6 psi.

Gravity is also helpful for determining up from down. There is a fluidic sack in you inner ear which you use to determine up from down. In zero G, there is no way you can determine up from down, and for many people this can create nausea and migranes.

Without gravity, your muscles would slowly degenerate. Without the need to use your muscles, you would lose a significant percentage of your muscle mass. Astronauts in space are subject to hours of physical excercise such as CardioBiking and Resistance training with springs (because weights don't work) to ensure they can survive when they get back to Earth.

Although, if you get the chance to experience zero G, it's a really neat experience. Look up the "Vomit Comet".

Answer 2

Gravitation is a natural phenomenon by which all objects attract each other. In everyday life, gravitation is most familiar as the agency that endows objects with weight. Gravitation is responsible for keeping the Earth and the other planets in their orbits around the Sun; for keeping the Moon in its orbit around the Earth; for the formation of tides; for convection (by which hot fluids rise); for heating the interiors of forming stars and planets to very high temperatures; and for various other phenomena that we observe. Gravitation is also the reason for the very existence of the Earth, the Sun, and most macroscopic objects in the universe; without it, matter would not have coalesced into these large masses, and life, as we know it, would not exist.

Modern physics describes gravitation using the general theory of relativity, but the much simpler Newton's law of universal gravitation provides an excellent approximation in most cases.

In scientific terminology gravitation and gravity are distinct. "Gravitation" is the attractive influence that all objects exert on each other, while "gravity" specifically refers to a force which all massive (objects with mass) objects are theorized to exert on each other to cause gravitation. Although these terms are interchangeable in everyday use, in theories other than Newton's, gravitation is caused by factors other than gravity. For example in general relativity, gravitation is due to spacetime curvatures which causes inertially moving objects to tend to accelerate towards each other. Another (discredited) example is Le Sage's theory of gravitation, in which massive objects are effectively pushed towards each other.

Under normal Earth-bound conditions, when objects move owing to a constant gravitational force a set of kinematical and dynamical equations describe the resultant trajectories. For example, Newton’s law of gravitation simplifies to F = ma, where m is the mass of the body and a is the acceleration. This assumption is reasonable for objects falling to Earth over the relatively short vertical distances of our everyday experience, but does not necessarily hold over larger distances, such as spacecraft trajectories, because the acceleration far from the surface of the Earth will not in general be g which is acceleration due to gravity (9.8 m/s2). A further example is the expression that we use for the calculation of potential energy Ep of a body at height h ( Ep = mgh or as Ep = Wh, with W meaning weight). This expression can be used only over small distances h from the Earth. Similarly the expression for the maximum height reached by a vertically projected body, h = u2 / 2g is useful for small heights and small initial velocities only. In case of large initial velocities we have to use the principle of conservation of energy to find the maximum height reached.

Answer 3

gravity help us by keeping us on the earth still otherwise we would have been flying out in the sky.gravity is a type of energy which pull us down to the aerth.itis mAINLY EXERTED BY EARTH.IF GRAVITY WOULD NO T HAVE BEEN THERE THEN HOW REPRODUCTION HAVE TAKEN PLACE AND HOW YOU WOULD BE ASKING ME THIS QUESTION

Answer 4

WIthout gravity, we would all be floating around the earth! It aslo aids digestion (unless we are lying down while we eat!) LOL

Answer 5

Keeps us all from flying off the earth and into outer space along with our atmosphere and everything else.

Answer 6

Well, it keeps us from floating up into the atmosphere where the pressure would kill us. I think that's probably the only reason you NEED.

Answer 7

except floating round the earth,your organs like your kidneys,oesophagus,... wouldnt work correctly.

Answer 8

It keeps us on the earth.

Answer 9

it keeps our brain working in right direction

Answer 10

it helps you balanced