- SRQ baller24
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- Exalted Mythic Member
Posted by: FedeleE
You place a box weighing 282.6 N on an in-
clined plane that makes a 39.5 angle with the
horizontal.
Compute the component of the gravita-
tional force acting down the inclined plane.
Answer in units of N
down the incline = 282.6*sin(39.5)
normal to the incline = 282.6*cos(39.5)
if you can't remember the rules for sin and cosine then do a logic check. What if the angle was 0 degrees? Then it is obvious that sine goes with the horizontal as there should be no force and cosine goes with vertical as it is the weight of the box.
Also, my physics teacher always said "it's a sin to fall down" as a way to remember it.
[Edited on 12.09.2012 9:03 PM PST]