Hard Question

Parkboy

Parkboy

Active member
Maybe someone can help me out here. Which will roll down an incline faster, a can of water or a can of ice? Defend your answer.

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a can of ice. It would be frozen to the insides of the container, meaning that it would be one solid object rolling down the hill. The can with water has a liquid inside, that when it is rolling down the hill, creats friction and slows the rate at which the can moves.

-Thom Savery

please pardon the cacography

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'I hope you get hit by a neon'
 
Agreed, the whirlpool caused by the rolling motion will cause friction against the side of the container.

..Seth Pistols rock my fuckin socks..
 
no but the can is completely filled with water, so the water has no room to move

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if they're both full and the same size, they'll roll at the same speed because they're both the same mass of the same substance... just in a different state.

 
ice is actually less dense than water, thus causing the phenomenon of pipes bursting when they freeze. Therefor, a can of water will weigh slightly more than a full can of solid ice and will gain momentum quicker and also reach a faster terminal velocity. If you want to disagree, good luck at debunking science.

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Rowen

'Aren't you Buzz Lightyear?'

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but he said rolling down a ramp, so terminal velocity doesn't apply. But.. if it was freefalling, they would both reach terminal velocity at the same time.... that i'm pretty sure of.

 
^i agree. water is of higher density so if it is completely full it will be of greater mass than ice and therefore excellerate faster and gain greater momentum. yeah i remember gr11 physics!

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Dude, the wouldnt reach the same terminal velocity. They may be the same size, but the weight is different, so the one with ice will have a slower terminal velocity. I just did my homework for 3 hours....

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Rowen

'Aren't you Buzz Lightyear?'

*whispers* 'I love your movies!'

'URAAAAFWAAAGAAA!!!'

 
Ok lets review...

If we drop a golf ball and a bowling ball which hits the floor first? they both hit at the same time... everyone should know that by now.

Both cans are full, so no extra resistance is created by water 'sloshing' aroung.

Since items of difference mass are affected by gravity at the same rate and there are no other apparent variable, they will roll at the same velocity, even though the water one may have a slightly higher mass.

______________________

Screw this I'm going skiing
 


Free fall has different kinematics than an object rotating down an incline.

You have a lot more things to consider. Especially the rotation of the can because they have different masses, and those different masses will create a different rotational acceleration.

 
AHHHH! The water filled can will roll slower.

The apparent difference in mass has nothing to do with it! It still has the same accelerating force (gravity) which is key!

Assuming the cans will rotate as they go down this hill THE WATER WILL ROLL SLOWER!!!

Because as ther can is rotating the main body of liquid water inside the can will not. This will cause a resistance to the roll due to friction, untill all the water is spinging at the same rate that the can is rolling. (then they will role at the same speed)

There!!

 
the ice will roll faster! Even if the bucket is completely full, the water will still create friction while it accelerates to the speed the walls of the bucket are moving. The ice has to roll, because it is solid and presumably frozen to the sides of the bucket. I'll draw a picture for the retards. The picture will look like a retard drew it, just to warn you.

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Oh... I thought you meant real anti-freeze, I was like 'Jesus man, you must be a drinking god to still be alive.' -skierman

'You're not drunk if you can lie on the floor without holding on.'

'I don't like people who take drugs... Customs men for example.'
 
this didnt turn out like I wanted it to.

9753watervs.jpg


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Oh... I thought you meant real anti-freeze, I was like 'Jesus man, you must be a drinking god to still be alive.' -skierman

'You're not drunk if you can lie on the floor without holding on.'

'I don't like people who take drugs... Customs men for example.'
 
hey brad (Ilovehead). Guess what. Your wrong and Im right!. I never even took physics! i just want to point this out for future refrence.

Also, that picture is so bad i cant even read it.

And brad. 'ok brad. your right brad. yes brad. ok brad.' ahahaha

-Thom Savery

please pardon the cacography

--->CCR*

'I hope you get hit by a neon'
 
powderCanuck takes this one...speed is not affected by mass...

i hope harvey bans you just so i can piss on your digital grave.

~mommy
 
hey parkboy. what did the teacher say the answer was?

-Thom Savery

please pardon the cacography

--->CCR*

'I hope you get hit by a neon'
 
and the answer actually was?

-Thom Savery

please pardon the cacography

--->CCR*

'I hope you get hit by a neon'
 
most of u are plain retarded

who agrees that friction from the water would be so little it wouldnt even come into effect?

who agrees the same volume of water is heavier than same volume of ice?

 
yeah whats the answer

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the free water molecules have inertia and will take longer to catch up to the rolling bottle than the static ice particles.

I think the ice will reach terminal velocity faster and more easily

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he made it up he know nuthing... also fuk stupid ass threads like this

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Yaya, but i wasn't wrong about the terminal velocity thing with them both freefalling... even though that had no relevance to the question...

but yes, sure thom, whatever you say thom... there there thom

 
the weight of an object is determined by the equation w=mg, where w is weight, m is mass and g is gravity in m/s squared. having a greater mass will increase the weight of an object but not the acceleration due to gravity. the water can will however be affected by a friction force between the water and the can even when full. the coefficient of friction in this case will be minute hance making the water can accelerate with less magnitude, although only slighty. so the answer is....the ice can will roll faster

 
2 objects will fall at the same speed unless there is another force acting. There is no other force since you said that the water couldn't move. It's like dropping a golf ball and a bowling ball of a building. Both will hit at the same time.

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first off their not falling, second off you have to factor in friction caused by the cans sliding down this inclind plane by the pull of gravity

-getting an inch of snow is like winning 10 cents in the lottery-
 
Right about now I'm glad I only had to take Science 30 once... I was a chemical nerd though. But at the expense of possibly being a moron and having people mock my IQ... my gut says the ice.

 
engineering major at University of Tennessee Knoxville - mass does have to do with acceleration as acceleration = force/mass The water moving around the inside of the can has no affect on the speed because the friction that matter is on the outside of the can. If its goin down a slope and not a free fall it cant reach terminal velocity - that is air resistance. really the only thing that would matter would be the difference of the mass between the 2. If i knew the angle of the hill and how long it was i i could tell you which would reach teh bottom first.

 
physics is just a way to explain retarded stuff

'Idle hands spend time at the genitals, and you know how much God hates that' - Ol' Drippy
 
the water in the can would be sloshing around and slow its acceleration. also, since the can with the ice in it is pretty peckin cold, then lower temperature will decrease the coefficient of friction between the can and whatever it is sliding on, HENCE the ice can is the winner

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ice because its a solid, water moves around in its container shiting its wieght back and forth

the ice will win

«*$*Carney*$*»

One time at mount Mckay..........
 
Look, I don't know if anyone has pointed this out... but have you ever tried to freeze water in a jar? Water expands when it freezes. You can't put it in a closed glass container, it has no room to expand. It would break the jar. The question is moot.

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Oh, and ice has less mass than water, thus the expansion when it freezes (decreased density) and thus the fact that ice floats on water. Because of said mass, water should win.

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In a haze

A stormy haze

I’ll be around

I’ll be loving you

Always

Always

Here I am

And I’ll take my time

Here I am

And I’ll wait in line

Always

Always...
 
You are overlooking a certain couple things JD. First it's not which will roll faster a jar full of water or a jar full of that water frozen. IT is comparing a jar full of water and a jar full of ice, two completely different volumes when both are in a liquid state. With that said the ice would have a smaller mass thus making the water have a greater gravitational pull. Therefore I would say the water is the winner. And now that I just typed all that I remembered that you said the water would win too, but I thought I would point out sa couple things.

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^How would you get a jar full of ice without pouring water in and then freezing it? That's my point. If you did that... no more jar.

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In a haze

A stormy haze

I’ll be around

I’ll be loving you

Always

Always

Here I am

And I’ll take my time

Here I am

And I’ll wait in line

Always

Always...
 
/\ you could figure out with mathematical equations what the required volume of liquid water you would need to duplicate the volume of the other barrel of water when frozen.

SO on to my point

the barrels are NOT in freefall so the equations w=mg, F=ma do not apply. there are many different factors to consider when something is rolling down a hill.

we are going to assume that the paths they take are identical and the surface along those paths is also identical. we are also going to assume that the barrel containing the ice has the same temperature on the outside as the barrel with the water in it(yes not possible but this is a hypothetical question and there has to be constants established and certain things must be assumed). The coefficient of kinetic friction between the hill and the barrels are also identical. the initial velocitys of the barrels are the same. the ice in the one barrel is bonded to the side of the barrel and there is no air in this barrel, and lastly there is absolutely zero air in the barrel filled with water, there is water in it and nothing but.

so with all of that said.

the barrel full of ice is one solid mass, the ice stays bonded and does not move against the sides of the barrel. the barrel filled with water is not one mass. the water does move within the barrel the molecules of the water are in motion or as somebody above me said, they have inertia. as the barrel full of water is sent down the hill the water molecules will not rotate with the barrel because the barrel cannot 'grab' the entire mass of water and spin it at the same rate as itself. because of this the water stands still sort to speak and there is friction between the water and the inside of the barrel. to demonstrate the fact that the water will not rotate at the same rate as the barrel fill a cup with water and put an ice cube in it. with the ice cube stationary rotate the glass with signifigant speed and watch the ice cube move not at all or very little. either way it will move much less than the amount you've moved the glass. the ice cube doesnt move because its floating in the water and the water did not move within the glass very much. this is exactly what is hapenning inside the barrel full of water. there is always friction between two moving masses, no matter how small, THERE IS FRICTION BETWEEN THE WATER AND THE BARREL.

now somebody above me said that the friction within the barrel does not matter, only the friction of the surface its rolling down. this is false. to demonstrate(use your imagination on this one): picture a suspended cylinder spinning in one spot rubbing against a surface at a constant velocity. if you were to stick your finger inside that cylnder and touch and of the walls of it it would most definitly slow down and may even stop. FRICTION ANYWHERE ON THE BARREL MATTERS.

SO with that established we can say that the water within the barrel does in fact rotate slower than the barrel itself and this does crate friction and friction on the inside does affect the barrel. so the ice creating no frction against the barrel will roll faster than the barrel with the water creating frction inside of it and the ice barrel wins. you are all owned, thank you im going to sleep now.

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-Charles Gagnier
 
some of you dudes are dumber than dick fucks... its all about momentum and shit... ice first

-:Carpe Poon:-

When worst comes to worst skiing comes first.
 
I agree with everything that sherlocke said, except that how the mass has no affect, which it does. Gravity is still acting, its just at the angle of the incline. It always comes down to Newtons Second Law, and if you write a sum of the forces equation I too believe that ice would be faster do to the internal friction of the water and it's moment of inertia. It would over power the slight addition of mass that it has on the ice.

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