You don’t feel the Earth spin because you, the atmosphere, skyscrapers, and everything else are spinning along with the Earth at the same constant speed.
It’s the same sensation as when you’re riding in a car or flying in a plane – as long as the ride is going smoothly. A jumbo jet flies at about 500 miles per hour – that’s about 800 kilometers an hour – about half as fast as the Earth spins at its equator.
But if you close your eyes, you don’t feel like you’re moving at all. And when the flight attendant comes by and pours coffee into your cup, the coffee doesn’t fly to the back of the plane. That’s because the coffee, the cup and you are all moving at the same rate as the plane.
Likewise, Earth is moving at a fixed rate – and we’re all moving along with it. Now imagine being on the jumbo jet again – think about what happens when the pilot suddenly speeds up or slows down the plane. You sometimes sense this change as a feeling of being pushed into your seat. In the same way, if the Earth were suddenly to speed up or slow down, you would definitely feel it.
But as long as Earth spins steadily – and moves at a constant rate in orbit around the sun – you as an earthly passenger move right along with it.
If the earth suddenly started to speed up we’d fall over backwards, and we’d have to lean into the direction of the motion to stand. If the earth were speed up enough that it spun once every hour and twenty minutes, we would fly off its surface. The next time you’re in a car or a plane traveling at a constant speed, close your eyes and try to feel that you’re moving. You won’t be able to tell.
Ancient humans noticed that the stars, and the sun and the moon all appeared to move above the earth. Because these people couldn’t feel the earth move, they logically interpreted this observation to mean that the earth was stationary and the “heavens” actually physically moved above us.
With the exception of the beliefs of ancient Greek scientist Aristarchus, who first proposed a heliocentric (“Sun centered) model of the universe, this geocentric (“Earth-centered”) idea was upheld for a long time. It would be Copernicus’s 16th Century heliocentric model that, although it was not without errors, would eventually convince the world that the earth spun on its own axis and that it moved around the sun.
Our thanks to:
Dr. Ed Prather
Montana State University, Bozeman
Department of Physics
Bozeman, MT
Dr. George Tuthill
Montana State University
Department of Physics
Bozeman, MT
…
I would like to thank you for the endeavors you have produced in publishing this article. I am trusting the same finest perform from you from the long term too. In fact your fanciful writing abilities has inspired me to begin my very own blog site now….
I tried many times to learn about this topic.I tried in many sites like wikipedia at last i found at google. I am very happy to know about it
Would you explain.. if i throw a ball above the sky at 90 degree why cannot it just moves ahead, instead it just come straight to me..
Oswin,
The displacement due to the Earth’s rotation is called the Coroilis force. In the case of a ball thrown straight up, the Coroilis force is probably negligible. But if it were a bullet, it’s a different story, with the maximum displacement taking place at the equator yet with no displacement at the north and south poles. Read what Professor Berezovsky has to say at http://www.quora.com/If-someone-shoots-a-bullet-straight-up-into-the-air-and-doesnt-move-what-will-happen.
Bruce
What if the earth stop moving would we not be able to move
well the example given above regarding the plane is vague, we are not inside the earth, we are on the earth, if the circumference of the Earth is 40,076 km and earth rotates to its original position in 24 hours, then if we do a simple calculation per sec earth rotates 464 meters, i.e. nearly half a kilometer.
when an air hostess fills our cup,it doesnt spill coz the air inside the plane is not in motion. will the same thing happen when we remove the top of the plance and try to fill the cup, I think no…
if a wind blows at a speed of 464 meters per second then it is a hurricane, and we dont feel such thing on the surface of earth… surface of the earth and not inside the earth….
Infact sometimes i see wind blowing in the same direction as the earth rotation. strange isnt it… atmosphere is not moving with us its running ahead of us…LOL….. :)
can we control the speed of earth and drive our earth in a direction we want? can we increase or decrease the speed of earth as we need?
i do not feet . this is the right explanantion of not experiencing earth spin. there must be some more explanantion. the answer shown on the google only seems right but somewhere rationally does not feel right. there must be some more explanation/priniiciles to this.
i am doing a project for school and this has really helped me.
thanks for the answer,
my 4.1/2 years old son, asked me why the earth turns and he does not. Now I know , but how can I explain it to him, is there somekind of experience I can do and explain to let this young curious toddler understand.
The earth spins at around 1200 mph, give or take and we don’t feel it. Regardless of that what I find even more crazy then that, is that the earth is going around the sun at 44,000 miles per hour, which you also never feel. So you are not just spinning at 1200mph, you are also flying through space at 44,000 mph which is almost 40 times faster then you are spinning. That is something very few people I’ve met understand. As far as I know when you travel at certain speeds you expierence G forces and humans black out and die at certain speeds. (7 G’s or so) which is slower then 44,000 mph I believe. The rocket that went to the moon (if it isn’t a hoax) I think traveled at 18000 mph. I thought even if you are in space and off earth you can still only travel at certain speeds before the human will die from it. This makes me think there must be a way to travel at 44,000 mph in a vehicle and not be killed from the speed. It takes years to get to mars because humans have a speed limit you can’t exceed without dying.
@Kevin You’re missing the difference between Velocity and Acceleration. Acceleration causes G forces, not Velocity. If your car is going down the road at 60mph, your acceleration is zero. If your car goes from zero to 60 in a set period of time, then your acceleration is the change in velocity, with regards to time (also known as the derivative, one of the key components of the Calculus) That’s why you feel G in a car taking off from a light, not in one cruising down the highway. No acceleration. The earth is essentially cruising, at a constant velocity. And no, there’s no set speed that will kill a human, but getting to that speed too fast, that is what does it.
This is very interesting but why dont we see the sun move when we are rotating so fast