- #1

ejacques

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If this is true why we measure weight only with the account of g?

I guess when R is big it might be neglected, but still I wonder

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- Thread starter ejacques
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- #1

ejacques

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If this is true why we measure weight only with the account of g?

I guess when R is big it might be neglected, but still I wonder

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- #2

Ibix

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You do see variation in gravity due to the presence of the moon and sun, though. This is the cause of tides and spring tides. It's just not a very large effect on a human scale, and depends on the gradient of the gravitational field strength, not the strength itself.

- #3

A.T.

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With a scale, we don't measure the Earth's gravitational force directly, just the force that opposes it.ejacques said:If this is true why we measure weight only with the account of g?

But nothing opposes the Sun's gravitational force.

- #4

Drakkith

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If you do the maths, then the gravitational acceleration of the Earth from the Sun is very small:ejacques said:I guess when R is big it might be neglected, but still I wonder

$$g_{s} = \frac{GM_s}{R^2} = 0.006 m/s^2$$And, using ##T = \frac{2\pi R}{v}## for the period of the Earth's circular orbit, we can rewrite the equation for centripetal acceleration:

$$a_c = \frac{4\pi^2 R}{T^2} = 0.006 m/s^2$$

- #6

We feel gravitational acceleration from the Earth because we are much closer to the Earth than to the Sun. Gravitational force decreases with the square of the distance, so the Earth's gravitational pull is much stronger on us than the Sun's, despite the Sun's much larger mass.

In terms of the force we experience directly, yes, the Sun's gravitational pull on an individual person is weaker than the Earth's because we are so much closer to the Earth. However, the Sun's gravitational pull on the Earth as a whole is what keeps our planet in orbit around it.

Gravitational acceleration is inversely proportional to the square of the distance between two objects. This means that if you double the distance between two objects, the gravitational force between them becomes one-fourth as strong.

Yes, if we were significantly closer to the Sun, its gravitational pull would be much stronger. However, at the current distance of about 93 million miles (150 million kilometers), the Earth's gravity is much more noticeable to us.

Yes, the Sun's gravity affects the entire Earth, keeping it in orbit around the Sun. This gravitational pull is crucial for the Earth's orbit and the stability of our solar system, but it does not affect us individually in a noticeable way compared to the Earth's gravity.

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