If you can create motion (acceleration) to an object with (>0) mass with no force then you have solved the energy crisis.
In other words you would be creating energy from nothing. Unfortunately, because energy is always constant in a system (energy can neither be created nor destroyed) this is not possible.
Lifting a load without applying any force is a job for the magicians.
When you increase the pulleys you reduce the force to be applied, but that is done on the expense of increasing the displacement that force has to go through. Every set of pulleys has its inefficiency, so you would end up with negative results by adding a new set of pulleys, in increasing the required applied force rather than reducing it, let alone the cumbersomeness.
If you have enough pulleys there will be so much friction that you don't need any force on the end of the rope to sustain a load. But no, you won't be able to move a load with no effort.
No.
*) Pulleys/levers/etc always provide a ratio. You can't divide a non-zero load by a finite amount and get a zero force.
*) All pulleys/levers/etc introduce at least some inefficiency and have their own non-zero force to move.
Ive always been interested in simple machines, and the most ive seen people use is like a 9:1 ratio pulley system whether it be a simple, compound, or complex. Is it possible to use enough pulleys to completely cancel out the load where it takes no force to move it? Thanks, Matt
