Lever and pulley Now that we have learned lever, we know that lever can be divided into labor-saving lever, equal arm lever and labor-intensive lever. Why should we introduce pulley? What are the advantages of pulley compared with lever?

Lever and pulley Now that we have learned lever, we know that lever can be divided into labor-saving lever, equal arm lever and labor-intensive lever. Why should we introduce pulley? What are the advantages of pulley compared with lever?

If you use a motor with a maximum pulling force of 1000N to lift 100 tons of things for 1m, if you use a lever, you must require that the lever is very long, which is not conducive to the operation in real life. If you use a pulley, you can easily lift the goods in place. The main consideration is from the operability and occupied space

Junior physics, leverage problem
When the two pedals of the bicycle turn to what position, the best effect is to pedal hard? Why?

It works best when you turn to the horizontal, so the arm of force is the largest when you turn to the horizontal