The pulley is a wheel which forms part of a simple machine that can be used to make lifting heavy objects easier. Learn more about world changing innovations with our Picture Encyclopedia!
PLOKK Ratas on ratas, mis moodustab masina osa, mida saab raskete esemete tõstmiseks lihtsamaks muuta. Selle mehaaniline eelis võrdub kasutatavate rataste arvuga.