quote:

Originally posted by Caela hehe...this is why I am not a physics major. Those were just guesses anyhoo

It also helps explain your hair color

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Originally posted by Lunar Phase 7 Did you even read my post? Please check that wikipage, cause I can't be arsed typing anymore.

Yes I did. Including the one that said "excluding the limited effect of air resistance)." That's a heck of a thing to exclude when you're answering a question about terminal velocity, a concept that depends on air resistance.

You first suggested that weight was immaterial to terminal velocity (ie air resistance met by a falling object). Then you implicitly conceded that it was relevant as demonstrated by my feather and elephant example (I chose an extreme example to demonstrate that in principle weight must be relevant as common sense would so dictate).

Crosswinds or "horizontal forces" are irrelevant in this case. Its a basic question of upward air resistance as opposed to downward force.

From basic principles look at it this way:

The upward force air resistance has on an object is proportional to A) the surface area of the object and B) the velocity of the object. A can be discounted because in our case the two objects are of the same shape.

Now terminal velocity is reached when the downward force of an object is equal to the upward force.

For simplicity's sake lets assume that the two objects are a polystyrene ball with a mass of 98 grams (downward force of 1 Newton) and a heavy metal ball of the same diameter with a mass of 10.2kg (downward force of 100 Newtons). Now assuming both begin to accelerate (gain velocity) at the same rate, and the upward air resistance begins to climb at the same rate - will it take the air resistance longer to climb to 1 Newton of upward force for object A or 100 Newtons of upward force for object B?


edit: looks like D-res has already explained all this in his post.

Looks like you're getting confused with Gallileos proof that objects accelerate at a constant speed of 9.8m/s/s if you exclude air resistance (ie in a vacuum.. it's precisely why in the wiki or wherever people talk about Gallileo they exclude air resistance). And the idea of terminal velocity to which weight is very relevant.

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quote:

Originally posted by astroboy Yes I did. Including the one that said "excluding the limited effect of air resistance)." That's a heck of a thing to exclude when you're answering a question about terminal velocity, a concept that depends on air resistance. You first suggested that weight was immaterial to terminal velocity (ie air resistance met by a falling object). Then you implicitly conceded that it was relevant as demonstrated by my feather and elephant example (I chose an extreme example to demonstrate that in principle weight must be relevant as common sense would so dictate). Crosswinds or "horizontal forces" are irrelevant in this case. Its a basic question of upward air resistance as opposed to downward force. From basic principles look at it this way: The upward force air resistance has on an object is proportional to A) the surface area of the object and B) the velocity of the object. A can be discounted because in our case the two objects are the same. Now terminal velocity is reached when the downward force of an object is equal to the upward force. For simplicity's sake lets assume that the two objects are a polystyrene ball with a mass of 98 grams (downward force of 1 Newton) and a heavy metal ball of the same diameter with a mass of 10.2kg (downward force of 100 Newtons). Now assuming both begin to accelerate (gain velocity) at the same rate, and the upward air resistance begins to climb at the same rate - will it take the air resistance longer to climb to 1 Newton of upward force for object A or 100 Newtons of upward force for object B?

Oksy, you've got your view, I got mine. Let's see the results when the guy takes the test.

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Originally posted by Nrg2Nfinit It also helps explain your hair color

Who said this is my natural hair color?

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quote:

Originally posted by Lunar Phase 7 Oksy, you've got your view, I got mine. Let's see the results when the guy takes the test.

It's not my view, it's basic physics.

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At low speeds the drag is much less than the gravitational force and so the object accelerates. As it speeds up the drag increases, until eventually it equals the weight. ... Mathematically, terminal velocity is described by the equation where Vt is the terminal velocity, m is the mass of the falling object, g is gravitational acceleration, Cd is the drag coefficient, ρ is the density of the fluid the object is falling through, and A is the object's cross-sectional area.

Source:http://en.wikipedia.org/wiki/Terminal_velocity

quote:

With all else (gravitational acceleration, density, cross-sectional area, drag constant, etc.) being equal, heavier objects fall faster.

Source:http://en.wikipedia.org/wiki/Drag_(physics)#Velocity_of_falling_object

___________________
"my son will be a gienues(sp?)" - Originally posted by Googooly
"many species of bear give blowjobs." - Originally posted by Sunsnail.. NOW CONFIRMED BY PHOTO EVIDENCE!
"astroboy is brave and gentle and wise." - Originally posted by pkcRAISTLIN
"ew! i wouldn't go anywhere near a homeless dudes butthole... not even if i was sodomizing him with a poison ivy cactus dildo" - Originally posted by lücid
"also can someone post the link to my mom's forum, thank you!" - Originally posted by miamitrance04
"dude man its not me its what the world does to me. Trust me I'm a normal person people just constantly fuck with me." Originally posted by ********
"I can see Lira getting a hard-on already. And believe me, Brazilian ass rape is the worst." - Originally posted by Meat187

quote:

Originally posted by Caela hehe...this is why I am not a physics major. Those were just guesses anyhoo

Yeah I'd probably suck at answering questions on what you're studying. But you shouldn't write yourself off. At least you attempted to answer the questions rationally, which is the main thing with maths/physics. If you wanted to you probably could major in physics.

___________________
"my son will be a gienues(sp?)" - Originally posted by Googooly
"many species of bear give blowjobs." - Originally posted by Sunsnail.. NOW CONFIRMED BY PHOTO EVIDENCE!
"astroboy is brave and gentle and wise." - Originally posted by pkcRAISTLIN
"ew! i wouldn't go anywhere near a homeless dudes butthole... not even if i was sodomizing him with a poison ivy cactus dildo" - Originally posted by lücid
"also can someone post the link to my mom's forum, thank you!" - Originally posted by miamitrance04
"dude man its not me its what the world does to me. Trust me I'm a normal person people just constantly fuck with me." Originally posted by ********
"I can see Lira getting a hard-on already. And believe me, Brazilian ass rape is the worst." - Originally posted by Meat187

quote:

Originally posted by Caela Who said this is my natural hair color?

could have easily fooled me

quote:

Originally posted by Nrg2Nfinit could have easily fooled me

At least I attempted to answer the questions...Where were your answers?

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quote:

Originally posted by D-res Wording your sentence like this can be potentially misleading for those unfamiliar. While you're correct in saying heavier objects will exert more downward force than lighter objects, one must keep in mind that the downward acceleration of gravity (-9.8m/s^2) is the same for all objects, regardless of weight.

I don't quite understand how my statement is misleading. All I am doing is stating Newton's second law.
Infact, your statement that acceleration due to gravity is constant, is misleading for objects falling in air.

As the object starts falling down the force of gravity is dominant and initially, there is no drag.
As the object speeds up, drag acts upwards and starts to nullify the effect of gravity.
It implies that acceleration starts with a finite positive value and ends up being zero at the instant the body reaches terminal velocity.
After that, the object continues to fall with a constant velocity and zero acceleration.

If acceleration due to gravity is constant, it implies that the object always has a constant net downward force acting on it,
and that it always speed up. But that is just not the case in air or any medium except for vacuum.

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Originally posted by Caela At least I attempted to answer the questions...Where were your answers?

i have the second last calculus to worry about here! jesus. See my calculus thread add your contributions there

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Originally posted by astroboy It's not my view, it's basic physics. Source:http://en.wikipedia.org/wiki/Terminal_velocity Source:http://en.wikipedia.org/wiki/Drag_(physics)#Velocity_of_falling_object

I dont't wanna fall out about this, I respect the fact you have took time to think this through, and you do seem to know your stuff, but I still say you are wrong. Or at least, the least right.

http://www.physlink.com/Education/AskExperts/ae6.cfm

Might be interesting to read.