ok, this is a question my science teacher asked me and I really don‘t get it. I did some math to find out the mechanical advantage, and it was 20N, which then meant to me using a pulley system with 20 ropes, but how can I find out how many pulleys? Does anyone know how to solve this? and if you can, can you also explain it? thanks! NOTE: N newtons
If you use one pulley to lift something it will cut the force needed in half, so if you divide 10000 by 2 you will get 5000. So it would take 5000N to lift the car with one pulley. If you divide 10000 by 2 five times you will get 312.5, so it takes 5 pulleys. But if one pulley has the rope on top the next one has to have one that has the rope on the bottom for the other to have one on top except for the last one because it does not need a pulley with the rope on the bottom. So it takes 9 pulleys. I hope that helped (it was probably a little hard to follow.)
