Gravity

the net force on bodies in stable orbit is nil, the force of gravitational attraction , is balanced by the centripetal force of velocity in a circle.

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example, any orbit radius ( if orbit time not important)

choose your orbit radius, calculate force of gravity, tailor velocity to produce balancing centripital force

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f=((G*m1*m2)/d^2) force of gravity

f = m2 *( v^2/d ) centripetal force

G = newtons constant

m1 = earth mass

m2 = satellite mass

d = orbital distance

Gravity has to do with the amount of mass an object has; not an atmosphere. The bigger the object, the stronger the gravitational pull. That's why people feel lighter on the moon than they do on Earth.

Yes, gravity is present on the moon. However, the gravity on the moon is about 1/6th that of Earth's gravity. This is why objects and people weigh less on the moon compared to Earth.

Yes, Rhea, one of Saturn's moons, has its own gravity. This gravity is weaker than Earth's gravity due to Rhea being smaller and less massive.

If sun's gravity suddenly disappears then the planets will stop to revolve around the sun after some time and this duration is equal to the time taken by the light to reach from sun to other planets.

For e.g. Time taken by earth to stop revolving and flying off in any direction = Time taken by light to earth from sun = 8 min. 20 seconds

Also, planets will start to fly in any direction and they may collapse and in simple words: Solar system will collapse and life will disappear on earth.

It is the nature of the gravitational force to attract things. The moon is in free fall around the Earth, as is the Earth around the Moon. They don't collide because they have significant angular momentum. This causes them to 'miss' each other constantly.

However the Moon is actually receding from Earth. This is because the tidal motion on Earth robs the Moon of energy so its orbit is increasing. At the same time the speed of Earth's rotation is also decreasing. In the end this effect will stabilize with the Moon's period of rotation around the Earth being equal to a day on Earth.

I am not sure what you mean by 'depend' (please try and make your questions clear) but if you mean does the fact that a helium filled balloon will float (or rise) depend on gravity? Then the answer is Yes. if you were to take a helium filled balloon to the space station and release it inside, it would not rise, it would behave just the same as if you released a bunch of keys.

You can typically find physical science previous papers and answers on websites that specialize in educational resources, such as exam preparation websites or academic forums. You can also check with your school or university's library or academic resource center for past papers and model answers. Additionally, reaching out to your professors or teachers for guidance on where to access previous papers can also be helpful.

We would be in really big trouble. Celestial bodies such as the Sun, but also the Earth and Moon are kept intact due to gravity. If gravity would reverse, that is, if matter started to repel each other, our planet would be blown up.

A planet simply could not exist, it would be like trying to build a planet using positively charged particles. They repel each other and you would need some additional (powerful!) force to overcome it.

Luckily it can be shown that any force originating from coordinate invariance, which means that the laws of physics are the same for every observer, which is the case for general relativity, that such a force must be attractive. It simply cannot be repulsive.

Neptune's gravity is strong, as it is the fourth largest planet in our solar system. Its gravitational force is about 17% stronger than Earth's.

The thermosphere at high altitudes has low density of molecules, so there are fewer particles available to absorb and retain heat. Additionally, the few particles that are present in the thermosphere are highly energetic, causing them to quickly lose any absorbed heat through radiation into space.

black holes are believed to have the strongest gravitational pull. that and beaches at spring break.

There is no such thing as 'zero gravity,' as even if you went a million lightyears away from an object, it's gravity would still have a minor affect on you. The only way to feel no gravity from an individual body such as the earth is to be in free fall. This is why the astronauts orbiting the earth dont feel its gravity, as contrary to popular belief, orbiting is actually just free falling at an angle where you constantly miss the object you are orbiting. Hope this helped!

Answer: It keeps up from being crushed from the atmosphere around us... it also keeps us from floating away and helps keep the earth the right temp.

Answer: Gravity keeps the atmosphere around the planet in the first place.

It is the other way round - gravity varies with altitude. In other words, you should consider altitude the independent variable. At a greater altitude, there is less gravitational force. This is explained by the equation - F(g) = G(m1m2)/(r^2) where G = constant, m1 and m2 = mass, F(g) = force due to gravity, and r = distance from center of mass. The altitude difference covered by humans daily (high buildings, hills) makes only a small, probably negligable difference in force due to gravity.

Yes. Rock forms around a larger rock. The mass of the planet increases enough to gain more gravity and crushes the rock around it compacting and smoothing it into a sphere. Also, nothing could exist without gravity.

Mostly because Saturn has almost 1,000 times as much mass as Mars has.

Their difference in physical size also affects the relative values of gravitational

acceleration at their respective surfaces. But that 1,000 times ratio of masses

is pretty easy to understand.

A quick way out would be to tell you that it does so because Einstein's theory of general relativity says it does and that we can check that it does and that the theory makes correct predictions, however a more deep explanation might be as follows:

It seems to be the case that the laws of physics are the same in every reference frame; this means that you can have your laboratory on the Moon, in deep space, accelerating or even rotating and all your experiments should leave you to deduce the same laws of reality. This is called coordinate invariance.

Now if you want to have this coordinate invariance, gravity MUST bend time. It is a direct consequence although a bit mathematical to show (but it can be done).

I might make it a little more clear by using special relativity instead, which basically is the consequence of coordinate invariance except that it does not allow for accelerations (therefore the general theory of relativity is the more general theory). We shall call this inertial frame invariance (an inertial frame is a frame that does not accelerate, a frame is basically a coordinate system).

Now, one law of physics is the constancy of the speed of light. According to inertial frame invariance one MUST arrive at this law always, regardless of which inertial frame you happen to be located in. But this causes problems, because this would mean that someone shooting a laser on a train must measure c (the speed of light) but someone standing still on the station must also measure c even though the train itself is moving! The only way this can be true is if the train shrinks in the direction of motion and time slows down for the person on the train. These are the time dilatation and length contraction predictions of special relativity. These effects occur because the laws of physics are the same in every inertial frame. It must be true or the speed of light would not be constant for everybody.

In the same way gravity must bend time. In fact you can even show that gravity itself is a consequence of coordinate invariance. If you want coordinate invariance you must have gravity.

The Moon's gravity causes the tides on Earth by exerting a pulling force on the oceans. This gravitational interaction also causes a small effect on Earth's rotation, slowing it down over time. Additionally, the Moon helps stabilize Earth's axial tilt, which contributes to the planet's climate and seasons.

Yes, gravity is a fundamental force that exists throughout the universe, including other galaxies. The strength of gravity depends on the mass of an object, so larger galaxies will have stronger gravitational fields.

Gravity is a force that exists, it is not like someone thought of it and then simply things started to fall down.

It is very likely mankind discovered that things fell down after being thrown up at early stages of their development.

As for any scientific theory of gravity, describing in mathematical terms what it does, this is usually credited to Isaac Newton who published his equation in 1687.

The gravity is less on the moon than on Earth because the Earth has about

80 times as much mass as the Moon has.

The diameter of the Moon also affects it. If the diameter is bigger, that puts you

farther away from the center, and the gravitational force decreases.

The laws of gravity seems to be the same everywhere in the Universe. There have been experiments using distant objects in the Universe to try and measure if it might be different far away (or back in time!), but no effect has been found to date.

In fact, the question seems to tie in with the question whether the laws of physics are the same everywhere in the Universe. This is because one can derive the equations of general relativity assuming the laws are the same everywhere for everyone. This is a bit technical, but basically if you want the laws of physics to be the same for everyone you MUST have gravity in the form Einstein proposed, there is no other way.

Of course other deviations from our laws of physics have been looked for, but again none have been found.