2006-12-14 01:56:59 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
Ice and Teflon (PTFE).
"Polytetrafluoroethylene (PTFE) is a fluoropolymer discovered by Roy J. Plunkett (1910–1994) of DuPont in 1938.[1] It was introduced as a commercial product in 1946 and (in an example of a genericized trademark) is generally known to the public by DuPont's brand name Teflon.
The coefficient of friction of PTFE is 0.1 or less, which is the lowest of any known solid material. It is used as a non-stick coating for pans and other cookware. PTFE is very non-reactive, and so is often used in containers and pipework for reactive chemicals. According to DuPont its melting point is 327 °C,[2] but its properties degrade above 260 °C.
Other polymers with similar composition are known with the Teflon name: fluorinated ethylene-propylene (FEP) and perfluoroalkoxy polymer resin (PFA). They retain the useful properties of PTFE of low friction and non-reactivity, but are more easily formable. FEP is softer than PTFE and melts at 260 °C;[3] it is highly transparent and resistant to sunlight."
2006-12-14 01:57:43 · answer #1 · answered by wvucountryroads 5 · 0⤊ 0⤋
check googles out search coefficient of friction down 4
2006-12-14 02:04:40 · answer #2 · answered by samuel b 2 · 0⤊ 1⤋
the coefficient of friction is dependant on the pair of materials and the operating conditions generally speaking rubber on rubber (favourable operating conditions) offers the highest coefficient of friction.
2016-05-24 02:20:19 · answer #3 · answered by ? 4 · 0⤊ 0⤋
1.oily surfaces which has coeff of friction .09 or less than
2.frictionless disc (a disc which has ballon over it which continuously gives air below the disc which make the disc to float over the surface) it has partically coefficent of friction zero. for the time ballon get completely gets empty.
2006-12-14 02:21:52 · answer #4 · answered by tushar p 1 · 0⤊ 1⤋
ice on metal has a low coefficient of friction (they slide past each other easily), while rubber on pavement has a high coefficient of friction (they do not slide past each other easily).
Metal on oiled polished granite
Suitcases on conveyer belt with ball-bearing rollers.
2006-12-14 01:59:27 · answer #5 · answered by DanE 7 · 0⤊ 1⤋
Ice and teflon. Ice on ice is supposedly the slickest surface known to mankind.
2006-12-14 01:59:08 · answer #6 · answered by Joe K 6 · 0⤊ 0⤋
glass and polished granite would be my first thoughts
(like a glass coffee table and a granite counter top... they have low kenetic coefficients but very large static coefficents)
2006-12-14 01:59:58 · answer #7 · answered by farrell_stu 4 · 0⤊ 1⤋
do your own homework.
I asked a homework question ONLY and ONLY when I already have the answer. I just wanna see if other people got the same thing and If my answer is the same, I use it. this isn't a homework help service.
2006-12-14 01:59:56 · answer #8 · answered by ** i Am hiS giRL ** 5 · 1⤊ 1⤋
Silicone & Ice.
2006-12-14 01:58:50 · answer #9 · answered by thesuper 3 · 0⤊ 0⤋
Oil and water.
2006-12-14 01:59:58 · answer #10 · answered by blue.green_eyes 5 · 0⤊ 1⤋