The drive element of a pulley system can be a rope, cable, belt, or chain that runs over the pulley inside the groove.

If the rope and pulley system does not dissipate or store energy, then its mechanical advantage is the number of parts of the rope that act on the load.

Image: Polispasto2B. jpg | A gun tackle has a single pulley in both the fixed and moving blocks with two rope parts supporting the load W.

Image: Pulley0. svg | Diagram 1: The load F on the moving pulley is balanced by the tension in two parts of the rope supporting the pulley.

Image: Pulley1. svg | Diagram 2: A movable pulley lifting the load W is supported by two rope parts with tension W / 2.

A fixed pulley changes the direction of the force on a rope or belt that moves along its circumference.

A single movable pulley is supported by two parts of the same rope and has a mechanical advantage of two.

Image: Pulley2. svg | Diagram 3: The gun tackle " rove to advantage " has the rope attached to the moving pulley.

These included traction trebuchet catapults, eight-foot-high ballistas, a wheeled siege ramp with grappling hooks known as the Cloud Bridge ( the protractable, folded ramp slinging forward by means of a counterweight with rope and pulley ), and wheeled ' hook-carts ' used to latch large iron hooks onto the tops of walls to pull them down.

However in the common use of the trucker's hitch, a static hook, ring, or rail, serves as the lower pulley, and the rope across the top of the load is the portion being tensioned.

* A rope is attached around the condemned's feet and routed through a pulley at the base of the pole

In rafting, biners are used in rope and pulley rescue systems to secure things to a raft and as items of adornment in river rafting.

The mangonel was loaded by lowering a rope with a hook at its end ; this hook was tied to another rope connected to a " pulling " system ( this could be a pulley compound, a gear compound, or even an animal traction system ) to pull the rope and lower the main rod.

In a differential windlass, also called a Chinese windlass, there are two coaxial drums of different radii r and r. The rope is wound onto one drum while it unwinds from the other, with a movable pulley hanging in the bight between the drums.

Ben gets his hand caught in a rope and Ray hoists him into the air where Ben's hand is cut off by the pulley and Ben falls into the ocean.

A bullwheel in each terminal redirects the rope, while sheaves ( pulley assemblies ) on the towers support the rope well above the ground.

However the rope available at the time proved too susceptible to wear and the system was abandoned in favour of steam locomotives after eight years.

Prior to the invention of tension rods drum skins were attached and tuned by rope systems such as that used on the Djembe or pegs and ropes such as that used on Ewe Drums, a system rarely used today, although sometimes seen on regimental marching band snare drums.

The tensioning system is usually rope, but bolt systems and turnbuckles have been used as well.

In the event of someone falling into a ravine or a similar terrain feature, with a rope or two, some carabineers, and knowledge of knots you can set up a rappel system to lower yourself down to the individual and set up a hauling system to allow another individual to pull you and the injured person out of the ravine.

The SkyJump did not qualify as the world's highest bungee as it is not strictly speaking a bungee jump, but instead what is referred to as a ' Decelerator-Descent ' jump, using a steel cable and decelerator system, rather than an elastic rope.

That is, in a frictionless system, every unit of force exerted on the working end would produce 3 units in the standing part of the rope over the load.

The Haida developed effective weapons for boat-based battle, including a special system of stone rings weighing which could destroy an enemy's dugout canoe and be reused after the Haida pulled it back with the attached cedar bark rope.

Unlike in lead climbing, the belayer takes in rope as the climber advances and slack is practically eliminated from the rope, minimizing the both the drop and shock load on the rope and protection system should the climber fall.

Until then, and whenever the rope system was stopped for repairs, locomotives hauled the trains up the incline.

Chinese rudders were not supported by pintle-and-gudgeon as in the Western tradition ; rather, they were attached to the hull by means of wooden jaws or sockets, while typically larger ones were suspended from above by a rope tackle system so that they could be raised or lowered into the water.

The vessel is attached to the anchor by the rode, which is made of chain, cable, rope, or a combination of these.

A cable or rode is the rope, chain, or combination thereof used to connect the anchor to the vessel.

Abacá rope is very durable, flexible and resistant to salt water damage, allowing its use in hawsers, ship's lines and fishing nets.

Abacá fiber was once used primarily for rope, but this application is now of minor significance.

Bouldering is a style of rock climbing undertaken without a rope and normally limited to very short climbs over a crash pad ( called a bouldering mat ) so that a fall will not result in serious injury.

Usually, instead of using a safety rope from above, injury is avoided using a crash pad and a human spotter ( to direct a falling climber on to the pad ).

It is thought of as the anchor of Tama-rereti's waka ( the Milky Way ), while the Pointers are its rope.

Crossbow bolts can be fitted with a variety of heads, some with sickle-shaped heads to cut rope or rigging ; but the most common today is a four-sided point called a quarrel.

For an object swinging around on the end of a rope in a horizontal plane, the centripetal force on the object is supplied by the tension of the rope.

The rope example is an example involving a ' pull ' force.

It is possible that a previous climber had top-roped the Arch leaving the rope scars. keturah

Using two pegs and a rope, this procedure is traditionally used by gardeners to outline an elliptical flower bed ; thus it is called the gardener's ellipse.

Baudhayana ( c. 8th century BCE ) composed the Baudhayana Sulba Sutra, the best-known Sulba Sutra, which contains examples of simple Pythagorean triples, such as:,,,, and as well as a statement of the Pythagorean theorem for the sides of a square: " The rope which is stretched across the diagonal of a square produces an area double the size of the original square.

The hot-dip process slightly reduces the strength of the base metal, which is a consideration for the manufacture of wire rope and other highly-stressed products.

The lead rope is separate, and it may be short ( from six to ten feet, two to three meters ) for everyday leading and tying, or much longer ( up to, eight meters ) for tasks such as for leading packhorses or for picketing a horse out to graze.

In Australian and British English, a halter is a rope with a spliced running loop around the nose and another over the poll, used mainly for unbroken horses or for cattle.

Longeing is the activity of having a horse walk, trot and / or canter in a large circle around the handler at the end of a rope that is 25 to long.

When pairs of horses are used in drawing a wagon or coach it is usual for the outer side of each pair to be connected to reins and the inside of the bits connected by a short bridging strap or rope.

A rein may be attached to a halter to lead or guide the horse in a circle for training purposes or to lead a packhorse, but a simple lead rope is more often used for these purposes.

Because the handle is attached to the resistance source by rope or similarly flexible media, the trajectory of the hands in the vertical plane is free making it possible for the rower to emulate the hand height difference between the stroke and the return.