Does rotation of Earth affect gravity and what happens if Earth rotates faster than its present speed?
At latitudes nearer the Equator, the outward centrifugal force produced by Earth's rotation is larger than at polar latitudes. This counteracts the Earth's gravity to a small degree up to a maximum of 0.3% at the Equator and reduces the apparent downward acceleration of falling objects. As the earth rotates faster, the centrifugal force on a body at the equator increases, thus decreasing the weight of the body.
I am yet not quite sure how rotation of earth affects gravity here, but if earth would rotate faster, which it actually did many many years ago in the absence of moon, then a day on earth would be much shorter as it is today.
The moon controls the rotation speed of Earth. At the past, when Earth had no moon, one day on Earth was only 6 hours long.
So, a day will get shorter as the earth rotate faster, or as the moon moves away from the earth, which is actually happening. And that is why we don't have actually 24 hours long day, but somewhat less than 24 hours a day.
Well, the moon is really moving away from earth, 4 cm every year, well on the scale of the Universe it is not that much but yeah still as the year passes we would be having a shorter day.
We don't exactly know why moon is moving far away from us, but I believe it could be because of the Expansion of the Universe, but yes it is and we will find out in the near future.
At very fast speeds like, about 24,000 mph and over thousands of years, eventually the Earth's crust would shift too, flattening out at the poles and bulging around the equator. “We would have enormous earthquakes. The faster you travel the slower time goes, so if anything we would age slower. As already mentioned though, from our perspective time will always continue as it has. As you can see, if the Earth spins 17 times faster, the object on the equator will experience a centrifugal acceleration which is approximately 9.7 m/s 2. This means that this acceleration opposes the acceleration due to gravity. We do not age because of Earth's rotation. We age because our bodies get older as time passes. We use Earth's rotation and orbit to measure time, but they are not what cause time to pass. The slowdown of earth's rotation will continue for 4 billion years as long as we can imagine. The slowdown infinitesimally but steadily changes the globe's geometry and makes it dynamic. The net result of these dynamic adjustments is that the earth is slowly becoming more and more like a sphere. The acceleration due to gravity decreases due to rotation of the earth. This effect is zero at poles and maximum at the equator. As the earth rotates, a body placed on its surface moves along the circular path and hence experiences centrifugal force, due to it, the apparent weight of the body decreases. That's because of the extra centrifugal force that's generated as the equator spins faster combats gravity. Press fast-forward on that, and your weight would drop even further.
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