Single movable pulley

Troops marching into battle were naturally already tired and worn out by the time they arrived at the battleground. The mongols were fit because their horses did all of their walking for them. They were also vastly faster than foot soldiers.

If your trying to get water out of the well

lever at crank, connected by chain to lever at rear wheel

yes

A double pulley system is simple. Instead of one wheel like the

single pulley system has, the double pulley system has two

wheels and carries more heavier loads than the single pulley system

can hold.

We use it for people who wash windows out side as a job,and for wishing wheels.

The thing you pull or push to flush the toilet. LOL

Wheel and axle.

* Correction - The proper names for a pulley, which is a part of a set of "blocks" include the sheave (the wheel), the axle (supports the sheave which rotates around it), the thimble or terminal (a hook or loop), the cheek (to the side of the sheave), and when it is set up, it includes the line (the rope). Assembling the line properly through the blocks is called "reeving".

Bicycles with external gears have two, one guide pulley and one tension pulley, both in the rear derailleur. Some bicycles have further pulleys on the frame for either the brake or the shifter wire to run over.

The plural for pulley is pulleys.

The rule for making nouns ending with 'y' plural is:

If the 'y' is preceded by a vowel, add 's'.

If the 'y' is preceded by a consonant, drop the 'y' and add 'ies'.

The zipper is a wedge... your welcome everyone who needed it(:

Mechanical advantage of a fixed pulley

if you use a double fixed pully, it could make the rope or wire haver that much more preasure

it helps because the pressure is on the wheel and you can easily slide the rope over the wheel