2007-10-12 03:32:32 · 6 answers · asked by Hermione 2 in Science & Mathematics ➔ Physics
WHY? TELL YAAAARRRRRRRRRRR
2007-10-12 03:44:19 · update #1
Yikes! Friction absolutely does NOT depend on the surface area of contact! Read your physics books, people!
Technically, the answer depends on these things:
* The WEIGHT (not surface area!) of the roller or block;
* The material that the object (roller or block) is made of;
* The material that the object is rolling/sliding against.
The formula is:
For sliding:
Friction = Weight x (coefficient of sliding friction)
For rolling:
Friction = Weight x (coefficient of rolling friction)
The coefficients of friction depend on the nature of the two materials that are rolling/sliding against each other.
Almost none of that information is given in the problem(!) so it's impossible to say for sure. However, if we assume that the weight of the block is the same as the weight of the roller; AND that the roller is also made of wood; then it's a safe bet that the coefficient of rolling friction will be less than the coefficient of sliding friction, and therefore the roller would have less friction.
2007-10-12 04:07:33 · answer #1 · answered by RickB 7 · 0⤊ 0⤋
Obviously the wooden block...
coz , the block has a "large area of contact" with the surface...
try pulling a roller and a wooden block... Its hard to pull a wooden block bcoz of larger friction.
2007-10-12 03:41:20 · answer #2 · answered by Anonymous · 0⤊ 1⤋
it depends on surface area of contact. the wooden block maybe so thin and super smooth surface in contact with another surface shall have lesser friction than a roller of wider surface area of contact and has rough surface texture on same contact surface of the earlier wood, and of same angle of slope for both of them to slide, ergo, the wood will slide faster or of less friction than the roller, though the roller is cylindrical and the wood is a flat surface. In physics, I may remember, computation of friction effect depends on the area of surface in contact, and the angle of the inclined plane the object rubs against in motion.
2007-10-12 03:51:38 · answer #3 · answered by johnny N 3 · 0⤊ 1⤋
What is the roller made of? If it's metal, I would think the wood block has the higher friction.
2007-10-12 03:41:46 · answer #4 · answered by fflgeek2004 3 · 0⤊ 0⤋
Offcourse the wooden block, more contact surface, but then consider the type of material that is in contact with. Atomic structures.
2007-10-12 03:48:07 · answer #5 · answered by Anonymous · 0⤊ 1⤋
i'm not sure but i think it's the roller
because it totally depend in its rolling motion on friction as it won't roll unless there is a friction
but i'm really not sure so i can't guarantee this for you.
sorry if this doesn't help
2007-10-12 03:40:25 · answer #6 · answered by 1101-1001 2 · 0⤊ 0⤋