Why aren't we thrown in space?

Question

Why arent' we thrown in space while the Earth is rotating fast?
i Know it's because of gravity but can Please someone explain More?
maybe, like 5 sentences..

Answer 1

Because the Earth's gravitational pull is strong enough to keep us on the ground.

When viewed from an inertial frame of reference, the application of Newton's laws of motion is simple. The passenger's inertia resists acceleration, keeping the passenger moving with constant speed and direction as the car begins to turn. From this point of view, the passenger does not gravitate toward the outside of the path which the car follows; instead, the car's path curves to meet the passenger.

Once the car contacts the passenger, it then applies a sideways force to accelerate him or her around the turn with the car. This force is called a centripetal ("center seeking") force because its vector changes direction to continue to point toward the center of the car's arc as the car traverses it.

If the car is acting upon the passenger, then the passenger must be acting upon the car with an equal and opposite force. Being opposite, this reaction force is directed away from the center, therefore centrifugal.[6] It is critical to realize that this centrifugal force acts upon the car, not the passenger.

The centrifugal reaction force with which the passenger pushes back against the door of the car is given by:




where is the mass of the rotating object.

The reactive centrifugal force[7] is a real force, but the term is rarely used in modern discussions.[8][9]

Answer 2

The simple way to put it is that the centripetal force we feel due to the rotation of the Earth is not even close to the force we feel due to Earth’s gravity. Gravity wins and keeps us down to the floor. This is less than five sentences.
My calculations show that if the Earth rotates 17 times faster than what it does today, people standing at the equator will start feeling enough force outwards to balance the force of gravity. This is the starting point before they get thrown out into space. In my calculations I have wrongly assumed that the change in rotation speed will not cause any other change. However, angular momentum should be conserved. If we apply the equations you will see that the radius of the Earth will change from 6,380 Km to 1,547 Km if the Earth were rotating 17 times faster in order to maintain the angular momentum. This will cause the volume of the Earth to decrease 70 times, hence increasing the density of the Earth from 5,510 Kg/m3 to 385,524 Kg/m3 assuming that not much mass has been thrown away as the Earth increased its rotational speed. I don’t know if such high density can in fact be taken by the Earth’s core. Probably the Earth will crack and we would not have to worry about being thrown up into space as we will have to deal with more serious problems before that happen. Rest assured our lifeless bodies will be thrown into space. Additionally, my numbers show that if Earth rotates 17 times faster then people will have to move to latitudes higher than 86 degrees (towards the north and south poles) to feel comfortable as long as balance between gravity and centripetal force concerns.
I can’t even imagine what would happen to the oceans as the Earth increases its rotational speed. Sorry, more than five sentences.

Answer 3

1. Because the Earth isn't rotating fast enough.
2. Think about it: Our planet makes a rotation once every 24 hours.
3. Since the Earth's pull inward is greater than the centrifugal force pushing outward from the planet's spin, we stay on the ground.
4. This is the fourth sentence.
5. This is the fifth sentence.

Answer 4

The escape velocity of a planet is given by V=√[2gR] where g is acceleration due to gravity and R is the radius of the planet.If it is applied to earth substituting the values for g and R, we get value of 11.2 Km per second(approximate).So any object which is pushed towards space with the above speed will overcome the gravitational force and escape into space.Space crafts are launched like this only.As the gravitational force of a body is always greater than the centrifugal force(due to the earth's rotation) as far as earth is concerned,the gravitational force only counts and any object injected into space with a speed more than the above value overcomes the gravitation and escapes into space.We are not pushed like this and so we remain on the earth due to gravitational force.

Answer 5

Thats a physics question and its really easy. Take an example of a key tied to a thread that u rotate on ur fingers (like a fling). when the key goes a full circle around ur fingers ur fingers are steady and u prevent the key(with the thread) to escape from ur grasp. so ur fingers pull the thread and the key towards u (centripetal force) and the key because of its rotatory motion tries to move out(centrifugal force) and the forces r balanced such that neither the key comes to u nor it moves out , it simply rotates. Same with the earth , gravitational pulls in(centripetal) and centrifugal force pulls out. Neither wins and u simply rotate!

Answer 6

The centrifugal force of the surface may throw you off at a tangent but it is too weak compared to the power of gravity.
Gravity again is explained by distortion of space by matter in the Theory of Relativity of Einstein. As the mass of earth is more, space is distorted and you are always pulled towards the centre of gravity of the earth. Walking, jumping, tennis, ball games all involve our forces against gravity. And gravity always wins unless u reach the "escape velocity".

Answer 7

we are pulled toward the earth bc it is spinning, try filling a small bucket half way full of water, tying a rope to the handle and swing it around. if you practice for a while you will be able to spin it upside down and the water will still be held in the bucket. its my understanding that it is the same principle that holds you to the ground.
although i might be wrong....lol but its still cool that the water will stay in the bucket