____1.Which of these is a wedge?
A. a shovel, a knife, an axe, needle
B. Elevator, cargo wells, blinds on the window
C. screw, ruler, egg beater
D. can opener, saw, plank


2.why are teeth example of wedge
A. they cut object
B. they can lift object with less force
C. they can pull down object with less force
D. they have falcrum, force arm and work arm



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