Does Earth's Rotation Create Gravity?

In summary, the conversation discusses the origin of Earth's gravity and whether it is caused by the rotation of the planet or its mass. It is stated that in elementary school, the understanding was that rotation created gravity, but the expert summarizer explains that gravity actually comes from an object's mass. There is also a discussion about the Earth's rotation being a result of its creation and the conservation of angular momentum. It is suggested that there may have been a misunderstanding in the teaching of gravity in the past.
  • #1
Bill E
5
0
In Elementary School, many years ago, we where taught Earths gravity is created because our planet rotates. And if the rotation stopped, we would have no gravity. My present understanding is gravity comes from an objects mass. It seems rotation would be a result of gravity, not the creator of gravity.
 
Physics news on Phys.org
  • #2
Bill E said:
In Elementary School, many years ago, we where taught Earths gravity is created because our planet rotates. And if the rotation stopped, we would have no gravity. My present understanding is gravity comes from an objects mass.
If you were taught that, it is very unfortunate. It is quite wrong. I can't imagine a teacher in the last century actually thinking gravity was caused by rotation. Is it possible that it was just a misunderstanding on your part?

It seems rotation would be a result of gravity, not the creator of gravity.
The rotation of the Earth is not the result of Earth's gravity. There is no general requirement that a mass the size of the Earth must rotate at all.

But, in a way, gravity (of the sun and the solar system) did cause the Earth's' rotation. The rotation of the Earth is the result of the way the Earth was created, probably from a moving cloud of matter from a supernova that got captured by the sun's gravity. The angular momentum of that original cloud is conserved in the angular momentum of the planets and their moons.

AM
 
  • #3
It could be a misunderstanding, but a coworker who is 13 years younger than myself remembers being taught the same thing.
Thank you for the clarification.
 

1. How does the Earth's rotation affect our daily lives?

The Earth's rotation causes the cycle of day and night, which affects our sleep patterns and daily activities. It also influences the direction of winds and ocean currents, which in turn impact weather patterns.

2. Why does the Earth rotate?

The Earth rotates due to its initial spin during its formation. As the Earth formed from rotating gas and dust particles, it inherited this rotation and has been spinning ever since.

3. What is the speed of the Earth's rotation?

The Earth rotates at a constant speed of about 1,000 miles per hour at the equator. However, the speed decreases as you move towards the poles.

4. How does gravity keep the Earth in orbit?

Gravity is the force that keeps the Earth in its orbit around the sun. The Earth's orbit is a balance between the centrifugal force of its rotation and the gravitational pull of the sun.

5. Can the Earth's rotation and gravity change?

Yes, the Earth's rotation and gravity can change over time due to external factors such as tectonic movements, melting ice caps, and changes in the Earth's mass distribution. However, these changes occur over long periods of time and are not noticeable in our daily lives.

Similar threads

Replies
5
Views
1K
Replies
37
Views
2K
Replies
22
Views
1K
Replies
3
Views
851
Replies
10
Views
1K
Replies
23
Views
3K
Replies
46
Views
3K
Replies
8
Views
1K
Replies
5
Views
2K
  • Classical Physics
Replies
28
Views
899
Back
Top