Wheels on axles {wheel and axle} {axle and wheel} allow objects to move horizontally with no sliding friction. Pulley wheels on axles can hold rope, which can lift weight short vertical distances by pulling rope using small forces over long horizontal distances. Pulleys can alter force direction. One rope can wrap around two pulleys to make a block and tackle, to lift heavy objects short distances with small forces applied over long distances.
Physical Sciences>Physics>Dynamics>Machine
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Date Modified: 2022.0224