How long does the pulley rope move?

The moving distance of the moving pulley rope is 25N. The moving pulley is essentially a lever that saves twice as much effort. So you can get twice the result with half the effort, but the distance of membership fee is twice. If the pulley lifts the weight 10m, the free end of the rope moves 20m and the weight is 50N. People only exert a force of 25N on the free end of the rope (ignoring friction, pulley and rope weight).

In the pulley block, the distance S moved by the free end of the rope is the height H raised by the object, S=nh, the number of strands connected between the rope and the moving pulley, the distance moved by the free end of the rope and the height H raised by the object.

Extended data

Knowledge points:

1, the mechanical efficiency is equivalent to the friction force between parts that move relatively, so using any machinery, in addition to doing useful work, it is inevitable to do extra work. At this point, the total work done by power is equal to useful work plus extra work. The ratio of useful work to total work is called mechanical efficiency. It is represented by the symbol η, and the calculation formula is η=W with /W total * 100%.

2. The ratio of useful work to total work of mechanical efficiency is expressed by the symbol η, and the calculation formula is η=W /W * 100%. Power refers to the speed at which an object does work per unit time, that is, power is a physical quantity that describes the speed of doing work. The workload is fixed, and the shorter the time, the greater the power value.