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HI, I've attached a rough diagram(emphasis on rough) of a waiter holding a tray, there is a downward force of 5N acting on the clockwise side, and a downwards force of 25N on the anticlockwise side of the pivot, which is his middle finger.

The total force acting down is 30N, so therefore the middle finger or pivot is giving an upwards force of 30 N.

I just want to know, if the waiter moves the tray up, is the middle finger the effort or is the thumb the effort?

The total force acting down is 30N, so therefore the middle finger or pivot is giving an upwards force of 30 N.

I just want to know, if the waiter moves the tray up, is the middle finger the effort or is the thumb the effort?