noun
A wheel with a grooved rim for a rope or cable, used to change the direction of a force or gain mechanical advantage. In compound terms, it can refer to a block-and-tackle system.
工事現場で滑車を使って重い資材を持ち上げた。
They lifted heavy materials using a pulley at the construction site.
滑車の原理を利
By using the principle of the pulley, you can move a large load with a small force.