Gravity

The forces that affect the rate of a falling object are Gravity and Air Resistance.

Gravity affects the speed and the velocity of the object by speeding it up as it falls closer to the earth, and Air resistance works against the object pushing against it.

Let's take these one-at-a-time ...

-- Time doesn't 'stop'. If you shoot past Bob at high speed, and you and Bob look at each others'

clocks as you pass, Bob will say that his clock is running normally and yours is running slow, while

you will say that your clock is running normally and Bob's is running slow. You'll both be correct.

If you were moving past Bob at the speed of light, Bob would say that his clock is OK and yours

has stopped, while you would say that your clock is OK and Bob's has stopped. Again, you would

both be correct.

-- You don't reach the speed of light.

-- Within a certain distance of a black hole, light can't escape.

(That's why the region looks black from outside of it.)

The light trapped in there is still moving at the speed of light.

But nothing else in there is moving at the speed of light.

This is not what I was asking and is incorrect (I edited my question for clarity). It is motion that is relative. Bob can claim you are moving or you can claim Bob is moving and both are correct. Time is different if you speed up you move through space faster thus you move through time slower. If you traveled at speeds near the speed of light for years when you returned to earth the people on earth would have aged more than you. Space and time are part of the same fabric. Once you reach the speed of light time stops because you are moving through space as fast as you possibly can thus there is no room for you to move through time. When it comes to the distortion of space time velocity and gravity are the same. If you are in a place with high gravity time slows down. So if you are in a black whole which has enough gravity to over power light which time stops at, does time go in reverse inside the black hole.

Oil has the highest specific gravity. Water has the second.

7129 / 6105195 is part of a message left behind by Edward Leedskalnin regarding his "Answer to the Universe".

A spinning object does not create gravity. But it does create centripetal forces (also previously known as centrifugal forces) whereby an object traveling the path of a spinning object is propelled toward the outside wall of the spinning object, due to the force angled to the rotation of the circle counteracting the force of the smaller object traveling tangent to its path. The strength of this force is often measured in "G's". A "G" is equivalent to the force of gravity, ie: 2 "G" is equivalent to twice the force of gravity.

On the earth's surface at the poles we find gravity will be the strongest. The earth is what is called an oblate spheroid, and that means it bulges out in the middle (the equator). That also means the poles end up a little closer to the center of gravity, and you'll weigh more there.

Ten times Earth's gravity would produce a gravitational force equivalent to 100g (100 times the acceleration due to gravity on Earth). This extreme force would exert immense pressure on the body and could be potentially lethal.

The force of gravity on the second apple would be 2N, as gravity exerts a force that is directly proportional to the mass of the object and the distance from the center of the Earth. Since the second tree is twice as tall as the first one, the force of gravity acting on the apple at the top of the second tree would be doubled.

If the force of gravity of Earth were to drop to zero, to put it in simple terms:

Firstly, the whole atmosphere would leave Earth. Meaning all living things would most probably die as many of us can't live without air.

Secondly, the moon would most probably float off to space. Without Earth's gravity, it is highly possibly we would never see the moon again. Either that, or the moon's gravity on its own could hold and it would merely be further away from Earth than usual.

Thirdly, those not clutching onto something would definitely float off to space as well. People who wants to be lighter would be happier however, as without gravity, everyone's weight is reduced to zero kg, zero grams, zero pounds, etc.

By definition a massless particle has no rest mass therefore it can not take up any spacial volume. I think the confusion lies with calling something that is massless, a particle. This is because as soon as we hear particle we think "object" and objects have definite mass and volume. A photon is massless and sometimes people may refer to it as a particle of light. But in fact that is sort of a misnomer being that it really isn't a particle, though it has particle-like properties. If something is massless theorists have said that the object does not interact with the Higgs field, though gravitational effects are still felt by the photon, example: gravitational lensing.

You can replicate the effects of increased gravity through speed. If you are in a moving vehicle which suddenly stops, you will get thrown forward, which is partially due to increased gravitational force or g-force. If you are on a fast-moving ride at a funfair, you experience increased gravity.

The diameter of the Moon is about 1/4 (one fourth) the diameter of the Earth (more precisely 27.2%).

Moon diameter = 3476 km (equator) 3472 km (polar)

Earth's diameter = 12756 km (equator), 12742 km (polar)

Jupiter, the biggest planet, exerts the strongest gravity.

The surface gravity on Mars is about the lowest in the solar system, roughly the same as Mercury at about four-tenths that of Earth. While it would not immediately be harmful, over a period of time a person living in lower gravity would experience some decrease in bone density, from demineralization - an effect similar to osteoporosis, which would contribute to chances of bone breakage and increased healing time. This effect would be reversible upon return to Earth gravity. There would also be a loss of muscle mass and strength, and possibly undesirable cardiovascular effects in the long term. There may also be undesirable long term effects related to balance, vision, blood volume, kidney function, and others.

Uranium is a heavy metal (a metal with a specific gravity of 5.0 or greater) with a very high density (18.95 g/cm3 , 1.7 times higher than lead's density of 11.35 g/cm3)

It's 9.8 newtons per kilogram.

Y'all come see us.

Don't be strangers now, y'hear!

The teacher's manual answer is that mass warps space. But the real answer is "Just Because" it's what mass does. == It's interesting in this day and age when we're on the threshold of discovering the very basic nature of the universe by virtue of our understanding of matter and spacetime that we don't know more about gravity. For as long as I can remember, the best answer for the question "what is gravity?" is this one: We don't really know. It's still true. Accept it. Say it with me: we don't really know. See? It didn't stop working just because we made that admission. We know what gravity does. There is a wonderful history associated with its quantification. We can sure measure its effects, can't we? Those elegant sets of calculations for, say, the music of the spheres, are nothing short of breathtaking. But what is it that is accessible to the rest of us that lets us get a handle on gravity? There really isn't too much. Let's review. Matter has mass and occupies space. By virtue of just existing, matter warps spacetime. It puts a dent in it. But that doesn't provide too much extra help. Spacetime is (hold on to your seat) a mathematical construct. Darn it! That ain't any help! Perhaps an experiment would help. Try something that's been passed along to teachers here and there. The necessary equipment list includes a bed sheet and two modestly heavy balls like croquet balls. Lighter balls like tennis balls won't work as well, but a bit of creative thinking and experimenting will allow one to make a good substitute for the wooden spheres. Four students hold a bed sheet by the corners and stretch it out. Hold it steady! Put a ball in near the middle. See the dent? That's what mass (the ball) does to spacetiime (the sheet). This is a two-dimensional model, but it is really quite good. Now add the second ball near the first one. (A bit of practice might be required because there are limits on what the bed sheet will allow. Try short sheeting the setup from one or from two adjacent sides.) The second ball makes a dent like the first one, but the space between them is deformed, and the balls will roll together. If they are placed too far apart, the demonstration breaks down, but that's where the practice comes in. Lastly, it's absolutely wonderful and exciting that we don't know more about gravity! We know all this other stuff. All this other science and technological stuff. And yet here is gravity! It is so big, so broad in its effect, that it is the large scale organizer of the whole universe itself! We have spent our entire lives in it, and we react to it without thinking when we move. And yet it stands in defiance of our understanding! Hey! Anybody wanna Nobel prize? Wanna become world famous? Wanna have hotties asking you for your phone number? We have this little problem that needs solving....

When the moon is full, the earth expierences a spring tide. A spring tide includes High high tides and low, low tides. This is due to the gravitational pull of the sun is cooperating with the moons gravitational pull therefore creating high tides on opposite ends of the earth and the same for the lows.

acceleration together a = (G*(m1+m2))/r^2 balanced by:

acceleration apart a = v^2/r

G = 6.67*10^-11 (m^3-kg^-1-s^-2)

m1 = mass 1 (say sun = 1.9891*10^30kg)

m2 = mass 2(say earth+moon= 6.048*10^24kg)

r= distance between cog's (metres)

v= orbital velocity (metres/sec)

gravity/distance/orbital velocity are all complimentary

Velocity is relative to the observer and or objects that are in the area , if your sitting in true zero gravity from your point of view you will be standing still but in-reality your velocity will based on your original thrust. Some one watching you (at a zero velocity) from another location might see you zoom by at the original velocity. So the new question is if that other person has zero velocity and is in zero gravity what time will it be when they look at their watch ? Hmmm

Without gravity, objects would not be pulled towards the Earth, so there would be no tides, no atmosphere, and no orbits of celestial bodies. Anything not directly tethered or attached to a surface would float off into space.

A planetoid about the size of Mars crashed into the early Earth likely pulled out a a Lagrange point by Jupiter's gravity. Then pulled into the Earth by both bodies gravity, in an off-center hit sending debris into space and leaving a small portion in space with the added Earth debris that was pulled together by gravity again into the moon. As it drags along its slow orbit it's slowly being pulled away at about an inch a year because the gravity of Earth isn't supporting it so well (for reasons I won't go into here.) Gravity can only be significantly felt between objects with a very large mass, like the Earth and Moon. Which is why you dont feel a gravitational attraction between you and your computer.

The Moon formed when gravity pulled pieces of rock and debris together into one big rock.

To escape the gravitation pull of an object you must travel at or in excess of the escape velocity. The direction of the escape velocity is always radially outward from the center of the object.