An efficient simple machine is a device that uses a small force to move a large force, such as a lever, pulley, or inclined plane.
An efficient simple machine is one that can perform a task with minimal energy input, such as a lever that allows a person to lift a heavy object using less force.
An efficient simple machine is a lever, which consists of a rigid bar that pivots on a fixed point to multiply or change the direction of an applied force.
