Pulleys

The block and tackle system has been used for centuries, with origins dating back to ancient times. However, the modern design and use of block and tackle systems began to emerge during the Renaissance period in the 15th century. It provided a mechanical advantage in lifting heavy loads and has since become a fundamental tool in various industries.

The mechanical advantage of a screw can be found by dividing the circumference of the screw by the pitch of the screw. In this case, the total mechanical advantage is equal to the circumference of the simple machine to which the effort force is applied divided by the pitch of the screw.

The compound pulley system was invented by Archimedes, an ancient Greek mathematician, around the 3rd century BC. Archimedes is also known for his contributions to geometry, physics, and engineering.

Output force is the force exerted by a machine or mechanism to accomplish a task. It is the force that is produced by the system as a result of input force, mechanical advantage, and efficiency of the system. The output force can be calculated using the formula: output force = input force x mechanical advantage.

A pulley can make your life easier by allowing you to lift heavy objects with less effort. By utilizing the mechanical advantage provided by a pulley system, you can distribute the weight of the load across multiple ropes and pulleys, reducing the amount of force required to lift the object. This can make tasks like lifting furniture, hoisting equipment, or raising sails much more manageable.

An output force is the force exerted by a machine or system to achieve a desired outcome or perform a specific task. It is typically the end result of a series of mechanical processes or actions within the system.

Input force is the force you put in to a machine. Output force is a force exerted by a machine.

You exert input force on the wheel and when the axle rotates it exert large output force.

It depends on what you are asking. 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. If you are asking about how a pulley can create a mechanical advantage, then that is another question. A pulley creates mechanical advantage only when configured in a particular way (see below). 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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Yes, a block and tackle is an example of a rotational force transformer. It uses multiple pulleys to multiply the input force to lift heavy objects. The rotational force applied to the pulleys transforms into a greater vertical force to lift the load.

To remove a pulley, you typically need to use a pulley puller tool. First, release tension on the belt connected to the pulley. Then, follow the specific instructions for your vehicle or equipment to use the pulley puller to gently remove the pulley without damaging surrounding components.

Hi, I'm having the exact same problem. In fact, mine got so bad that we had to drain the pool. Anyhow, still waiting for an answer to your question for my own use, but i can tell you what will NOT work!! (beware! they were recommended from people on the net) A clarifying treatment (usually a blue bottle) Will NOT WORK... (maybe even make it worse) A mineral treatment (usually green bottle) which helps control the minerals may work, but only temporarily, until the second you add any water, which is the point that my water reacted the worst ever, and was no longer even see through. and of course we know chlorine doesn't work...Be careful! Its bad having to drain your water and start all over again...like ME!

I live in S.W. Virginia and I have really bad iron-water. The only thing I've found that works is called Ferritab, made by Swimfree. Make sure that if you have the cartridge type filter, you don't use the Ferritab DE--as this will not improve your situation.

Sorry, kids, but the whole point of chlorine is that it is an "oxidizer". This means that it helps in the creation of "free oxygen", which will combine with virtually anything (Oxygen atoms usually travel in pairs as an O2 molecule which is fairly non-reactive. When split up into individual oxygen atoms, or free oxygen, it will react violently with just about anything). Free oxygen literally rips the bacteria and algae apart, killing it.

You may want to try a different purifying chemical. Bacquacil kills bacteria by turning the cell walls of single-celled bacteria into a gluey substance which then clumps up into lumps and sticks to the pool filter. This gluey mess then traps all the other contaminants in the water. The up-side is that there is no need for chlorine. The downside is that you have to clean your filter fairly often to get the gunk out.

DISCONNECT THE MOTOR MOUNTS ON THE LEFT SIDE, PLACE JACK UNDER OIL PAN, PUT PIECE OF WOOD BETWEEN JACK AND OIL PAN AND RAISE ENGINE. THIS WILL GIVE CLEARANCE BETWEEN FRAME RAIL AND IDLER. REPLACEMENT IDLERS ARE NO LONGER AVAILABLE FROM FORD, SO YOU HAVE TO KNOCK OUT BEARING AND REPLACE IT WITH NEW ONE. BEARINGS ARE COMMON AT MOST JOBBERS FOR LESS THAN 5 BUCKS. REMOVE SERPENTINE BELT REMOVE IDLER BOLT AND PULLEY, REPLACEMENT IS REVERSAL OF THIS. LOWER ENGINE, TIGHTEN MOUNTS AND YOU ARE READY TO GO.

Pulleys have been used for thousands of years by many different civilisations. It is impossible to say who first invented them or where.

On the cam gear is a small round indentation to be lined up with a raised line on the top of the top of the cylender head. on the flywheel is a line with a "T" to the left of it. It lines up with the slot in the bottom of the threads on the axess hole for the flywheel timing.

Judaism has influenced society in various ways such as shaping ethical principles, promoting social justice, and fostering a sense of community. It has had an impact on the development of legal systems, humanitarian efforts, and cultural practices in many societies around the world. Moreover, the emphasis on education and intellectual pursuit within Judaism has contributed to advancements in various fields.

Health inequalities can lead to disparities in access to healthcare services, resulting in poorer health outcomes for certain groups. This can exacerbate social and economic inequalities, impacting productivity and overall community well-being. Addressing health inequalities is crucial for promoting social justice and ensuring a healthier and more equitable society.

No, a blender is not a pulley. A blender is a kitchen appliance that uses rotating blades to mix, puree, or chop ingredients, while a pulley is a simple machine that is used to change the direction of a force or transmit motion.

the simple machine a pulley is one that has a rope from one end to another,for example the flag in front of our schools (canby lane elementary),if you want to bring the flag down you have to use a pulley

In a simple case of lifting a weight using a pulley, there are two ways to do it and two different results.

First, attach a pulley to the ceiling, and a rope to the weight which is on the floor. Run the rope through the pulley. Now we simply pull down on the rope and the weight is lifted up.

In the second case, we attach one end of the rope to the ceiling, the pulley to the weight, and pass the unattached end of the rope through the pulley. Now we have to pull the rope up, and the weight is lifted.

Now let's look at each job and what happens.

In the first case, pull the rope tight without lifting and hold the rope at the top, next to the pulley. If you now pull the rope all the way down to the floor, the weight goes all the way up to the ceiling. Note also that the tension in the rope is equal to the weight being lifted and that there is only one tensioned rope pulling the weight upwards. Passing over the pulley changes the direction of the tension in the rope but doesn't change it's pulling power. Pulling that rope from ceiling to floor is exactly the same as lifting the weight from floor to ceiling.

In the second case, tighten the rope before lifting and hold the rope where it exits the pulley on the weight. Now pull and your hand moves from there to the ceiling - about the same distance (but the other way) as you moved your hand in the other case. However, notice now that the weight is only half way to the ceiling. It is hanging on a loop of rope, one side going to the hook and the other going to your hand. This suggests that the weight is shared by these two parts of the rope and therefore the tension in each piece only needs to be half the weight. Your hand is holding half the weight. The ceiling hook is still holding the other half.

To finish the job, you will have to keep pulling more rope - all the rope which is still there from hook to weight pulley and back to your hand. That's the floor to ceiling distance. In the second case, you pull twice as much rope to finish the job.

And because it takes twice as long, it only needs half the force at any stage.

There are numerous Rattlesnake subspecies. Some are:

1. The Eastern Diamondback

2. The western Diamondback

3. Queretaran Dusky

4. Mexican Green Rattler

5. Santa Catalina Island Rattlesnake

6. Sidewinder Rattlesnake

7. Baja Rattlesnake

8. Banded Rattlesnake

9. Mexican Small-Headed Rattlesnake

etc...