A 10kg crate is placed on a horizontal conveyor belt. Draw a free-body diagram showing all the forces on the crate if the conveyer belt is speeding up.
Its mastering physics says to "Draw the force vectors with their tails at the dot. The orientation of your vectors will be graded. The exact length of your vectors will not be graded but the relative length of one to the other will be graded. "
The only other thing is there is long arrow pointing to right labelled "direction".
The Attempt at a Solution
I know that normal force will go perp to surface so positive y-axis, and F_mg will go along negative x-axis, but the friction force is making me think...The static friction force will point opposite the direction the object would move if there was no friction. The crate would move to left in this scenario, because it is on a conveyor belt accelerating to right. But thats what confuses me, because that would actually be the same direction as conveyor belt. Is this because of 2 reference frames, or nothing to do with that? thanks for any help.