Question

You push a large crate across the floor at constant speed, exerting a horizontal force F on the crate. There is friction between the floor and the crate. The force of friction has a magnitude that is:

A) zero
B) greater than F
C) less than F
D) impossible to quantify without further information
E) equal to F

Answer 1

normal force* frictional constant

Answer 2

you could argue that it's D since you really don't have much info, but we can actually answer this question. So the answer is not D


It's not choice A since we don't live in a frictionless world


It's not choice B because if the friction was greater than the force to move the object, then the object would NOT be moving. The force to move an object must be greater than the friction force holding it back if you want to move it


Finally, it's not choice E because if the the two forces are equal, then nothing happens. Again, the pushing/pulling force must be greater than the friction.


So the answer is choice C, and this is indeed the case since the force must be greater than the friction or the friction must be less than the force to move the object

Answer 3

thanks guys...for all the hlep today...it's been a hell of a day

Answer 4

i have no clue about physics
sonofa-ah did you figure out that one question earlier or did you see my post?

Answer 5

new post*

Answer 6

no...didn't see it...u have link?

Answer 7

oh yea..the diff eq one?

Answer 8

yes

Answer 9

ya i finally was able to get it lol...

Answer 10

http://openstudy.com/groups/mathematics#/groups/mathematics/updates/4e74de160b8b7d4f6cf7a870

i made a mistake in the first post so i redid it on a paper and scanned it for you