1) Which of the following explains why a bicycle uses a gear?
A.) The gear increases the effort force needed.
B.) The gear increases resistance force.
C.) The gear decreases effort force.
D.) The gear decreases resistance force.
2) Which of the following is a compound machine?
A.) a screw being screwed into a piece of wood
B.) a can opener
C.) a crowbar
D.) a wheel and axle
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