Pulleys

Gears Are Relevant To Pulleys Because Gears Turn Into Circles So Do Pulleys The Difference Between A Gear And A Pulley Is...

A Pulley : Pulley Has Strings To Hold On One Goes Up And The Other One Across

A Gear : A Gear Has No Strings To Hold On

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In the past, pulleys were commonly used for lifting heavy objects, such as in construction, mining, and agriculture. They allowed people to move loads more easily by distributing the weight and reducing the amount of force required to lift objects.

Condenser lamp is a laboratory apparatus used to cool hot vapors and liquid. This typically has a large glass tube containing smaller glass tube running the whole length where the hot liquids pass.

Yes, a movable pulley is attached to the load it moves. It is designed to reduce the effort required to lift an object by distributing the force needed to move the load evenly between the pulley and the person pulling the rope.

There are three main types of pulleys: fixed pulleys, movable pulleys, and compound pulleys. Fixed pulleys are attached to a structure and change the direction of the force applied. Movable pulleys are attached to the object being moved and provide mechanical advantage. Compound pulleys combine fixed and movable pulleys to increase both the weight capacity and mechanical advantage.

A single fixed pulley is a type of pulley that is attached to a fixed structure, such as a ceiling or a beam. It changes the direction of the force applied to lift an object, making it easier to lift heavy loads by redirecting the force needed. However, it does not provide any mechanical advantage in terms of reducing the effort required to lift the object.

A pulley is a mechanism with a wheel and a simple frame that can be connected to something, either a fixed object or a movable object. The purpose of the pulley is to decrease friction when redirecting the pull/force of a rope, chain, or some equivalent thing. A pulley creates mechanical advantage only when configured in a particular way (see below).

How and in what configuration is explained below, but in essence, for every strand of rope/cable/chain or its equivalent in a continuous system, the force is divided equally. How the rope exits the system determines whether or not the final strand should be counted in the division. A strand exiting from a fixed pulley is not counted, where as a strand exiting from a movable pulley is counted.

A pulley system creates mechanical advantage by dividing force over a length of rope or its equivalent, that is greater in length than the maximum distance the load can travel by using the pulley system. Through the use of movable pulleys or their equivalent, a system creates a mechanical advantage through the even division of force over multiple rope strands of a continuous rope. As rope, or its equivalent, is removed from the system, pulleys, or their equivalent, allow the side of the rope to apply force to the load. As the the system contracts, the load is lifted or moved (depending on the direction of the pull). The more strands created by the configuration, the greater the mechanical advantage. This is because every strand of rope or its equivalent created by the configuration of the system will take an equal amount of length of rope removed as the system contracts. Thus if there are three strands of rope created by the system, and three units of rope are removed from the system, each strand will contract by one unit. As the strands are parallel, or function in as parallel the overall contraction of the system is one unit, moving the load only one unit for every three units of rope removed. By distributing the force needed to move the load one unit over three units of the rope, this decreases the force needed on the pulling end by 1/3. This would be a mechanical advantage of 3:1.

One of the most common systems of mechanical advantage is a shoe lace system. The grommets of the system are the equivalent of movable pulleys. As lace is removed from the system, force is applied to grommet, contracting the system. The laces are much longer than the space that they are contracting, and to fully contract the space nearly all the lace must be removed, so we can clearly see that many more units of lace must be removed for every one unit of contraction in the system, thus mechanical advantage is created. Of course in a lace system friction quickly overcomes and limits the advantage created. But on the other hand the friction helps to hold the force exerted allowing you to cinch up you shoes more easily. Now with this example in mind, let's look at a more traditional pulley system.

The easiest way to understand how mechanical advantage is achieved may be to focus on the geometry of the system. Specifically by focusing on how force is applied to the load and why the configuration of movable pulleys distributes force and creates mechanical advantage.

Imagine a weight to which a rope is directly attached. The rope is fed though a pulley mounted on the ceiling (fixed pulley). If you were to pull the rope the weight would move up a distance equal to the length of rope pulled. This is because the rope is directly attached to the load. There is no mechanical advantage.

If we want to create a mechanical advantage we must attach a pulley to the load/weight so that force is applied via the rope's contact with the movable pulley .

So in the next scenario imagine the rope is directly attached to the ceiling, and is fed through a pulley attached to the load (movable pulley as the load can move). The distance from the movable pulley to the ceiling is 10 feet. Now imagine you were to grab the rope exiting the pulley (imagine the system has no slack), and raise it to the ceiling. Now you have 10 foot section of rope with both ends on the ceiling. Where does that leave the load? Since the load is connected to the system by a wheel that can travel over the rope it has not followed the end of the rope the 10 feet to the ceiling, instead it has stayed in the center of the rope, constantly dividing the distance of the remaining section of rope. The load will now be 5 feet from the ceiling (10 feet / 2 section of rope). It has move only 1 unit of distance for every 2 units the rope has moved. Therefore only 1/2 the force is needed to move the rope 1 unit. This movable pulley system therefore has a 2:1 mechanical advantage.

Now we will add another pulley to the ceiling. This is a fixed pulley and will not add any mechanical advantage, but will only redirect the force applied to the system. If we add another pulley to the load we will then have added mechanical advantage. When calculating the advantage added, you must observe the movable pulleys and their relationship to the load.

Imagine a system with a rope directly connected to a load. The rope travels through a fixed pulley on the ceiling to another pulley on the load and back up to a fixed pulley on the ceiling, and back down to the ground where it can be pulled. Drawn on paper this system will have four rope strands. For calculating mechanical advantage you must not count the strand exiting the final fixed pulley as the final fixed pulley only redirects force and does not add mechanical advantage. (if the system was to end with a pulley attached to the load you would want to count the final strand). In this scenario we have three strands of rope contributing to the mechanical advantage of the system so the advantage should be 3:1. But how can you prove this. Imagine each section is ten feet long. Thus we have 30 total feel in the system. We pull out 10 feet of rope, how far has the load traveled? Well, we know we now have 20 feet of rope in the system distributed over 3 equal strands of rope. That would make each strand approximately 6.66 feet long. The load would therefore be approximately 6.66 feet from the ceiling or 3.33 feet from the ground (10 - 6.66). By traveling only 3.33 feet for 10 feet of rope removed from the system we have 3:1 mechanical advantage ratio (10:3.33).

A final thought exercise to intuitively understand what can be a very unintuitive process. Imagine a 10 ft tall pulley system. Now focus on the amount of rope in the system. If you have three strands going back and forth you will have 20 to 30 feet of rope in the system (depending on if the final pulley is attached to the load or a fixed point). If you have four strand you'll have 30 to 40 feet. The particular amount is not important. What is important is to see that the only way the load can travel the 10 feet to the top of the pulley system is for nearly all the rope in the system to be removed be it 20, 30, 40, 50... ect. The more rope that must be removed and the more strands that divide the amount removed, the greater the division of the force over the rope and the less force is required on the pulling end of the system.

Of course this is a basic pulley system. If you attach pulley systems to pulley systems (piggy back systems) you can begin doubling forces quickly, and strands need not be equal in length for their dividing power to function. Z rigs, trucker's hitches, and others create mechanical force through attaching or creating a movable pulley to/on the rope. The overall geometry of the systems and the relationships of elements stay the same as does the reason for the mechanical advantage.

It is also important to note that there are configurations where a pulley or its equivalent may not be "movable", but mechanical advantage is created. Imagine multiple pulleys fixed to a ceiling and floor of a room. If one end of a cable was fixed to either the floor, ceiling or one of the pulleys and the system was threaded, it certainly would be creating a mechanical advantage. Though all pulleys are technically "fixed" the opposition force is magnified just as in any other system, and depending on the strength of the cable, ceiling, or anchors, one element may eventually fail because of the tension in the system. The amount of tension in the system is created though the mechanical advantage of the configuration, and though nothing may move but the cable, magnified force is applied to the elements of the system.

In summary, it may be helpful to focus on the geometric relationships in pulley systems to better and more intuitively understand the way in which they create mechanical advantage.

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The disadvantage of a fixed pulley is that if it's not fixed in a location where you need it, it's used less.

A fixed pulley has a mechanical advantage of 1, which means it doesn't provide any mechanical advantage in terms of force. It changes the direction of the force applied without multiplying it.

examples are tops of flag poles, bowflex ,window blinds ,and sails on a boat

A fixed pulley consists of a grooved wheel attached to a fixed point, such as a ceiling or wall. It does not move up or down but changes the direction of the force applied to it. The load is attached to the pulley, and the effort is applied to the other end of the rope or cable.

A big pulley generally lifts an object faster than a small pulley. This is because a big pulley has a larger diameter, which means the object will be lifted a greater distance in each rotation compared to a smaller pulley.

No, a zipper is not a pulley. A pulley is a simple machine that uses a wheel and axle to redirect force, while a zipper is a closure device commonly used in clothing that consists of interlocking teeth.

Thew pulley changes the direction of the effort force.

No, a pulley does not use a fulcrum. A pulley is a simple machine that utilizes a wheel and axle to redirect the force applied to it. It works by changing the direction of the force, not by pivoting around a fulcrum like a lever.

Pulleys can often be found in the garage for lifting heavy objects, such as bicycles or tools. They may also be used in the attic for raising and lowering storage boxes or in the basement for moving items up and down stairs. Additionally, pulleys are commonly used in exercise equipment like weight machines.

Pulleys work by changing the direction of the force applied to move an object. They consist of a wheel with a groove for a rope or belt and can be used to lift heavy objects more easily by spreading the force needed over multiple ropes. When a force is applied to one end of the rope, the object on the other end is lifted or moved.

A pulley makes work easier by reducing the amount of force required to lift an object. It does this by distributing the force needed to lift the object over multiple ropes and pulleys, which allows for the force to be shared among them, making the task easier to accomplish.

Pulleys are commonly used in various applications to lift or move heavy objects more easily. They are used in construction, transportation systems, exercise equipment, and even in simple machines like elevators and cranes. Pulleys help to distribute weight evenly and reduce the amount of force required to lift an object.

The three types of pulleys are fixed pulley, movable pulley, and compound pulley. Fixed pulleys are attached to a stationary object, movable pulleys move along with the load, and compound pulleys combine both fixed and movable pulleys to provide mechanical advantage.

An example of a fixed pulley is a flagpole. The pulley is attached to the top of the pole, and the rope passes through it to help raise and lower the flag. The pulley remains stationary as the flag is moved up and down by pulling on the rope.

Examples of pulleys include elevator systems, flagpoles, and weightlifting machines. These devices use pulleys to change the direction of a force or to provide mechanical advantage in lifting heavy objects.