Recent content by feetparts

I have to go do a few things, but I will definitely try to find and post a problem where you have to find the acceleration up an incline of a mass. I'll try to get it as close to the original as I can. Thanks again for dealing with me and my endless questions.

So let's say instead of moving at a constant speed in the original problem, it was accelerating, and asked me to find the acceleration. I wouldn't have enough information to do that, right?

If someone could answer that last question about F_a and acceleration, I'd be grateful. It's the last piece of the puzzle for me.

I understand that. So far, to find F_a, I've had to assume that F_a=W_\|. So if they're not equal, how would I find F_a? Basically, I only know how to do these when they're at a constant speed, sliding down the incline, or there's a pulley system with another mass and tension between them...

I guess I'm not fully understanding how you'd find acceleration if you do: Would the acceleration have to be given?

Okay, so on an incline plane, F_\| is always down the slope, parallel to it, because it's a component of Fg, and there is an applied force, F_a, moving up the slope? And since it's a constant speed, F_\|=F_a. Okay. I think my physics professor has done more harm than good to my physics...

Actually, I just realized something. All of the problems on that page deal with an object moving down the incline plane, and so do all of the diagrams. Since this problem involves the parallel force moving up the plane, drawing the F_\| and the F_\bot in relation to F_g doesn't work... Since...

Okay, I worked through all of the problems on that page, and now I understand exactly the reasons behind the \sin(\theta) Thanks so much, any chance you can teach my class in his stead?

Wow, he never taught us any of this... I want my money back. edit: i should say, he never taught us how to determine forces on an incline plane, only flat.

Thanks for the speedy reply! I'm mostly quiet in class, so I don't call him on his many mistakes, but it threw me for a loop when he explained "cos(90)=1 so ignore it." I imagine everyone else in the class felt the same way as I did, so kept quiet. (he gets irritable and takes it out on the...

Homework Statement A skier of mass 70.0kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him a distance of 60.0m up a 30.0 degree slope (assumed frictionless) at a constant speed of 2.00m/s? Given: \Delta r = 60m \theta = 30^\circ Mass...