Friction for "air-film" tables?
362474
It's almost impossible to calculate that, for air friction there is a physical constant that is mentioned in mechanical physics. but for a table, there is still a massive amount of friction being applied from the table. so i don't think that it can be calculated since the air friction changes in regards to speed. it could probably be approximated in a lab thou.
476031
Well, yes, neglecting any energy loss to friction (e.g. air resistance)
165642
power and lubrication
136353
If you consider a model in which both surfaces which cause friction have crusts and troughs, and their interlocking causes the frictional resistance, then it is explained as follows.\n\nThe lubricant molecules fill up the troughs in both surfaces and make them more or less even, and hence there is less interlocking among the two surfaces, and so less friction.
937470
Getting started, have to overcome static friction.  Therefore, force applied = static friction force just before movement\n\nF = umg\nF = 75N\nm = 20kg\ng = gravity\nfind u, plug and play\n\nsame problem for sliding friction
333756
Friction causes motion. The greater the coeeficient of friction is, the more force is being applied. With enough friction, you could tear skin, or even your whole arm! you can reduce friction by not puttin anything on it. e.g., shirts, socks, clothing etc..
985388
Ive seen them used before too but the efficiency and force they produce falls way short of compressed air.  Making an air canon would be your best bet and its probably safer.  It would definitely be easier to construct.
944360
It's coefficient of friction is 0.1, which is the lowest of any solid.\n\nPS Go to wiki
152907
Use a mouse pad, make sure its on a level surface.
979447
Let's see:\nThe triboelectric effect is only related to friction because they both involve adhesion. However, the effect is greatly enhanced by rubbing the materials together, as they touch and separate many times to create an electric charge.\n\nSo, yes.
135023
you will need a slide-rule and an abacus
834102
1)  I'm not entirely sure.  It may just be the preference of that publisher, or just that the quantities being compared were not measured more accurately than to two places.\n\n2)  The coeffecient of friction is basically a measure of how well two surfaces slide against one another.  Pressing down simply increases the force, it does not necessarily change the structure of the surfaces in contact.\n\n3)  The coefficient of friction has no units because it is a ratio.  If you were to write out the units being compared in a fraction, say 2 Newtons / 4 Newtons, the units would cancel out when divided.
988791
First off, nothing is perfectly smooth or anywhere near 100 % flat.  I work with what we call 'atomically' flat surfaces every day and they are actually quite rough. \n\nFor the system you're talking about I'd extimate somewhere between 1 and 50 microns of space between the sheets of glass depending on how much force you apply. \n\nAlso, remember that glass is not technically a 'solid' so if you're really looking for a good seal you may want to use a different material.
761342
We did something like this in my physics lab with an Atwood machine.  It was a pully with weights hanging from it.  I can't exactly remember how it worked, but maybe this will inspire you.  We also did something with an air track and these two masses colliding and we'd see which one would go in which diretcion.  You need a nearly frictionless surface, like an air hockey table or ice slab.
858739
Use Bernouillis equation and you will have your answer. You can use the equivalent lengths method to find the friction.
919106
They all involve friction, but I think you mean which has the most force due to friction, right? :-&#92;  If so, I believe the answer is that they are all the same.\n\nIn simple situations, the frictional force created by sliding two surfaces against eachother is given by:\n\nf = u * N\n\nWhere u (mu) is the frictional coefficient (an experimentally-determined constant) and N is the normal force, which is mg (mass times accelleration of gravity) if the surface isn't tilted.\n\nSo, assuming the frictional coefficient is the same for all sides of the book, there is no reason why changing the sides would make a difference.
1144696
gravity and air resistance.