What is the downward force on a drawbridge at different angles?

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The discussion focuses on calculating the downward force exerted on a drawbridge at various angles as it is lifted from a flat position. At 0 degrees, the force is zero since the bridge is flat on the ground. As the angle increases to 30 degrees and 60 degrees, the force can be determined using trigonometric principles, specifically the sine function, to account for the weight distribution. At 90 degrees, the full weight of the drawbridge, which is 100 pounds, acts downward. Understanding these forces is crucial for the design and operation of similar structures, such as a steel plate covering a window.
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Let's say I have something like a drawbridge that is 8' long (and 4' wide, not that it matters) and weighs 100 pounds. Let's say it is hinged at one of the 4' edges, and is otherwise flat on the ground. Suppose I grab the unhinged end and pick it up. What will the downward force as I pull it up say at 0 degrees, 30 degrees, 60 degrees, and when it is vertical (90 degrees)?

This is a real problem, but the above is a simplified version to the structure I have. It's more like a steel plate that is covering a window, and eventually a winch at the top will open and close the window with the plate.
 
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What do you think the force on the free edge is? Say the bridge is flat on the ground.
 

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