How does a crowbar used to remove the top of a box change the direction of the force?

?How does a crowbar used to remove the top of a box change the direction of the force?the crowbar is a simple lever. the fulcrum is the round neck. it works like a teeteer-totter, where the kid going down on one end is what pushes up the kids on the other end. the neck is closer to the work and the handles sticks out a much further distance, this gives you the mechanical advantage.

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