Mechanism(s): First Class Lever an Wheel and Axle
How does it work: When the lid of the can is placed in between both of the movable circles and when the handle is being pushed down to hold tight the can, it would cut the lid of the can directly through.
Item 2: Hole Puncher
Mechanism(s): First Class Lever
How does it work: When the load (the paper) is placed in between the Force and the Fulcrum, the holes would punch through the paper and in this way, less effort is needed.
Item 3: Nut Cracker
Mechanism(s): Second Class Lever
How does it work: When the nut is placed in between both handles and when both sides are compressed, the nut will crack and less effort would be needed.