00:01
All right, so in order to figure out how much force jimmy has to press with to keep the piano in place, we need to look at how the weight of this piano is distributed.
00:12
And so the weight is gonna be pointed straight down on our ramp here, and that's gonna be split into two vectors, or two parts of a vector.
00:21
And that's gonna be a perpendicular part and a parallel part.
00:26
And so this perpendicular part is gonna be balanced by the normal force acting on the piano.
00:34
And this parallel part, that's what's gonna be causing the piano to wanna come down the ramp, so that'll be our fg parallel.
00:44
And the force that jimmy applies, so we'll call that f jimmy, that is what needs to balance that.
00:52
So we need to know this parallel part of the weight force in order to figure out the force that jimmy has to apply...