0
Would you use a fixed pulley or movable pulley to lift a heavy load?
Wiki User
∙ 14y ago
Fixed if it weighed as less than you, but a movable pulley wouldn't be helpful here. You'd be best with a pulley with multiple supporting ropes.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What benefits do pulley simple machines have to man?
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, cable or its equivalent. 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 (in a continuous system). 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 equally distribute the loss of rope as rope is removed from the system. 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 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 work needed to move the load one unit over three units of the rope, the work needed to move the rope one unit decreases to 1/3 of what it would be if it was directly connected to the load. The force needed to move the load also decreases by 1/3, and thus this example system makes someone's work 3 times "easier" (though doesn't reduce the total work done, it just stretches it out over 3 times the rope). 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. But, if we add another pulley to the load we will have added mechanical advantage. It is important to note, when calculating the advantage added, you must observe the movable pulleys and their relationship to the load. Now 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 and the end of the system was pulled, there would be 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(move/break) because of the tension in the system. The amount of tension in the system is created through the mechanical advantage of the configuration, and though nothing may move but the cable (until failure of an element), 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. I hope this approach to explaining the how pulleys work has been useful. Now get out there and move something!
Why did Archimedes invent the compound pulley?
Archimedes invent the compound pulley around 250 BC. The invention was to utilize leverage to make moving a heavy object easier.
What kind of simple machines can help you lift heavy objects?
pulley, weels and axle. trust it
What is the difference between dol and hdol?
Direct on line starter and Heavy direct on line starter...... in HDOL CT is fixed.
How does a pulley help us do work?
A single pulley is one of the "simple machines" in physics, and makes work seem easier by redirecting the action required to work along with gravity. For example, you can lift something by by pulling down on a rope.Multiple pulleys make work even easier, but you need to do more of it: running a rope through six pulleys will make the load seem 1/6 as heavy, but you'll have to pull the rope six times as far.A handy guide to the simple machines is here.A pulley helps us work by lifting large load that we could not do by ourselves.
What is a fixed and movable pulley used together?
When a fixed and movable pulley are used together, the fixed pulley is attached to a stationary object while the movable pulley is attached to the load being lifted. The combination of these pulleys allows for a mechanical advantage, making it easier to lift heavy objects by requiring less force.
Is a single fixed pulley superior than a single movable pulley?
A single movable pulley is typically considered superior to a single fixed pulley because it reduces the amount of force needed to lift an object. The movable pulley changes the direction of the force applied, making it easier to lift heavy objects.
What is the difference between a fixed pulley and movable pulley?
A fixed pulley is attached to a stationary object and changes the direction of the force applied, while a movable pulley is attached to the object being moved and reduces the amount of force needed to lift it. Fixed pulleys provide a mechanical advantage in changing the direction of force, while movable pulleys provide a mechanical advantage in reducing the amount of force needed to lift an object.
Explain why the combination pulley is named?
The combination pulley is named because it is composed of both fixed and movable pulleys working together to lift objects. The fixed pulley is attached to a structure while the movable pulley moves with the load, allowing for a mechanical advantage in lifting heavy objects.
What are the differences between a fixed pulley and a moving pulley and how do each of them change work?
A fixed pulley is stationary and changes the direction of the force applied, making it easier to lift an object. A moving pulley is attached to the object being lifted, reducing the force needed but requiring a longer distance to be moved. Both types of pulleys reduce the amount of work needed by spreading it out over a longer distance or making it easier to lift the load.
What effect does a movable pulley have on the effort force?
A movable pulley reduces the effort force required to lift an object by distributing the force between two sections of the pulley system. This means that you only need to apply half the force compared to a fixed pulley to lift the same load.
A movable pulley can?
reduce the amount of force needed to lift an object by distributing the load between two ropes. When one end of the rope is attached to a fixed point, the movable pulley can create a mechanical advantage, making it easier to lift heavy objects.
What is the 3 Types of pulley?
The three main types of pulleys are fixed pulleys, movable pulleys, and compound pulleys. Fixed pulleys are stationary and only change the direction of the force, while movable pulleys are attached to the object being moved and reduce the effort needed. Compound pulleys combine both fixed and movable pulleys to provide a mechanical advantage for lifting heavy loads.
What is the advantage of using a movable pulley?
A movable pulley reduces the amount of force needed to lift an object because it changes the direction of the force. When using a movable pulley, the load is shared between the pulley and the user, making it easier to lift heavy objects.
What are two types of pulleys?
There are two basic types of pulleys. When the grooved wheel is attached to a surface it forms a fixed pulley. The main benefit of a fixed pulley is that it changes the direction of the required force. Another type of pulley, called a movable pulley, consists of a rope attached to some surface. The wheel directly supports the load, and the effort comes from the same direction as the rope attachment.
What is the function of a movable pulley?
A movable pulley changes the direction of the applied force, making it easier to lift heavy objects. As the pulley moves with the load, it reduces the amount of force needed to lift the object by distributing the weight between the two sections of the rope.
What is an example of a block and tackle pulley?
A block and tackle pulley system consists of one fixed pulley and one moving pulley working together to lift heavy loads with less effort. For example, a flagpole typically uses a block and tackle pulley system to raise and lower the flag.
