Gravity

[Sombrero]

This is supposed to be a representation of the Earth and the Moon in perspective (of size and distance)...

http://www.traipse.com/earth_and_moon/earth_and_moon_1280.jpg

If this is so, then why can I roll a marble past a housebrick without the marble going into housebrick orbit?

Or I suppose, how can the Earth have enough gravity to hang on to the moon?

 

[Dextraneous]

If this is so, then why can I roll a marble past a housebrick without the marble going into housebrick orbit?

It might have something to do with the fact that the marble and the brick have to contend with something with a bit bigger gravitational pull - i.e. the earth

 

[Sombrero]

If this is so, then why can I roll a marble past a housebrick without the marble going into housebrick orbit?

It might have something to do with the fact that the marble and the brick have to contend with something with a bit bigger gravitational pull - i.e. the earth

So on the ISS, the marble would circle the brick? or a plectrum would come crashing into your chest if you let go of it (lots of videos of the peeps on the ISS doing stuff with small inanimate object which don't get attracted to much larger bodies inches away !)

 

[Nige F]

Carry the marble and brick to the top of the eiffel tower - drop them together - see which one hits the ground ,or a french person , first Kill 2 birds with one stone . Understand gravity and revenge on the french

 

[JBR]

A marble, and even a brick, have such tiny amounts of gravity it is almost unmeasurable.

 

[Dextraneous]

A marble, and even a brick, have such tiny amounts of gravity it is almost unmeasurable.

Mm/r^2

 

[Sombrero]

A marble, and even a brick, have such tiny amounts of gravity it is almost unmeasurable.

Mm/r^2

But relatively speaking, the marble and brick are bigger and closer together than the Earth and Moon, yet act much less strong !

 

[Dextraneous]

A marble, and even a brick, have such tiny amounts of gravity it is almost unmeasurable.

Mm/r^2

But relatively speaking, the marble and brick are bigger and closer together than the Earth and Moon, yet act much less strong !

It's a bit like someone using a match to burn your fingers, but both of you have your hands in the flame of a blow torch. Which has the greatest impact and which pales into insignificance?

 

[Sombrero]

A marble, and even a brick, have such tiny amounts of gravity it is almost unmeasurable.

Mm/r^2

But relatively speaking, the marble and brick are bigger and closer together than the Earth and Moon, yet act much less strong !

It's a bit like someone using a match to burn your fingers, but both of you have your hands in the flame of a blow torch. Which has the greatest impact and which pales into insignificance?

But on the ISS, things don't head earthwards... do they? aren't they gravity free?

 

[Dextraneous]

But on the ISS, things don't head earthwards... do they? aren't they gravity free?

Nothing is gravity free providing there are masses involved. If you were able to take that brick and whatever it was out into space far enough then they could be set up to move in orbit of each other providing escape velocity hadn't been reached.

 

[Sombrero]

So why don't all things on the ISS gravitate towards the Earth?

 

[Dextraneous]

So why don't all things on the ISS gravitate towards the Earth?

They do insomuch as the ISS is constantly falling towards the earth otherwise it'd fly off in a straight line. So all things inside it do too. But relative to the ISS, things appear "weightess", er, I think

 

[Sombrero]

So why don't all things on the ISS gravitate towards the Earth?

They do insomuch as the ISS is constantly falling towards the earth otherwise it'd fly off in a straight line. So all things inside it do too. But relative to the ISS, things appear "weightess", er, I think

Ok, I think i get what you're saying.... and us humans haven't experience true non gravity.

Isn't gravity classed a a weak force?

And how did a geezer 500 years ago work all this out?

 

[Dextraneous]

So why don't all things on the ISS gravitate towards the Earth?

They do insomuch as the ISS is constantly falling towards the earth otherwise it'd fly off in a straight line. So all things inside it do too. But relative to the ISS, things appear "weightess", er, I think

Ok, I think i get what you're saying.... and us humans haven't experience true non gravity.

Isn't gravity classed a a weak force?

And how did a geezer 500 years ago work all this out?

Allegedly from a granny smith and thinking about it incessantly

 

[JBR]

So why don't all things on the ISS gravitate towards the Earth?

Don't forget that the ISS has gravity of its own, and that is far in excess of a brick and a marble.