effort force: the force applied to a machine
resistance force: the force that a machine acts against
lever: a simple machine made of a rigid bar on a pivot point
fulcrum: the pivod point of a lever
machanical advantages:the number of times a machine multiplies the force applied
pulley: a grooved wheel that turns by the action of a rope in the groove
wheel and axle: a simple machine made of a handle or axis attached to the center of a wheel
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