Is there such a thing as frictionless surface?...?
830928
your teacher is a dick head.
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.
556094
Friction is not a force... It just is... It only exists when two objects, or things are in contact with each other.\nIf a force is acting on an object to move it, friction acts in the opposite direction.. It's simple as that. Obviously if the force is not greater than the friction, the object will not move.\nSo the direction of friction is opposite to the direction of the bicycle's movement, so in the same "Direction" for both wheels.
66741
Rubber in contact with other surfaces can yield friction coefficients from 1.0 to 2.0.\n\nhttp://en.wikipedia.org/wiki/Friction
950717
in order for perpetual motion to occur, both surfaces have to be frictionless, and there can't be any air density.  Eventually, the ball in your question will stop as a result of friction from the table and air resistance.
44667
You have a contradiction in your statement.  Static friction implies no movement but velocity is movement.  \n\nIf you mean the velocity of an object in dynamic equilibrium has a result of a frictional force (kinetic though) like sliding a block across the floor then you have to know the amount of work put into the system.  Then use work-kinetic energy theorem.
450309
you mean like silicone?\nor earthquakes?
62038
Without even falling off.\n\nDo I get 10 points tomorrow? Please let it be me!
994120
The special case of mechanical equilibrium of a stationary object is static equilibrium. A paperweight on a desk would be in static equilibrium. A child sliding down a slide at constant speed would be in mechanical equilibrium, but not in static equilibrium.\n\nIn static equilibrium there is not only a status quo, but there is no motion at all. In dynamic equilibrium there is motion but the overall situation is unchanging.
1119730
ahh, good theory problem...\nlet's see, there's energy, friction, force (normal, tension, as well as the other ones mentioned), gravitation, mass, pendulum motion, gotta be more that I've missed, but no doubt someone'll be here to correct me.
767789
decrease potential energy.....through physical factors like friction....
443615
Friction is hte result of Newton's law which says that to any action there is an opposite and equal reaction. Friction is the result of the interlocking of uneven parts of two substances. So you can understand what would happen if there was no reaction to an action. There would be no football, hockey, swimming, baseball, and all other sports.
721826
"Arent all particles material?"\n\nNo.\n\nThere is a concept called wave-particle duality.\n\nHere is an example of a non-material particle, the phonon:\n\nhttp://en.wikipedia.org/wiki/Phonon
711358
The surface of the following:\na table\na desk\na fence\na diving board\na newspaper page\na book cover\na sidewalk (as long as its straight)\na blackboard\na TV screen\nsome mirrors\na ceiling\na wall\na shower tile or floor tile\netc,etc,etc
26736
look up stuff like static friction, and your coefficient of friction...
62076
A\nB would be for a polished surface,\nC and D are never true (although on a macroscopic scale it can appear that they are).
196200
the fact is that in the nucleus there is no actual contact between the protons and the neutrons..they are held only by the electrostatic forces.so asolutely no friction