Hi, I'm facing a pretty silly problem and I will appreciate if you can help me. I face the following diagram: [PLAIN]http://img808.imageshack.us/img808/6273/inclinedplane.jpg [Broken] Forget about the all the missing values in the painting(like that cart's mass, the value of θ, etc..) they are irrelevant, my question is about a principle. Now, what I need to figure out is the component gravity acting along the ramp. To figure it out I created a little triangle, placed the right angles, and marked the force acting along the ramp(which I need to figure out) as H: [PLAIN]http://img30.imageshack.us/img30/189/markedinclinedplane.jpg [Broken] So, in order to figure out H, I did the following: sinθ = mg/H H = mg/sinθ Pretty easy am I right? Except according to the book I'm reading the right answer is: H = mg * sinθ How can it be? I didn't draw the triangle right? Is there other way to figure the force acting along the ramp? Thank in advanced!