A screw is an incline plane wrapped around a bar.
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The bar is a rigid straight finite object that is attached to one fixed point. The bar can be moved but the point where it is attached must stay where it is. In theory, therefore, the bar can be rotated around that fixed point in any direction. At the level of mathematics that your question suggests, the bar is movable in only one plane.
fulcrum
A line graph is shaped like a triangle and a bar graph is exactly like column but bar graph is other way around
A lever
It depends on the size of the bar and on the current price of gold. Right now gold is around $1600/oz so a one ounce bar would be worth $1600.