answersLogoWhite

0

Pulleys

A pulley is a mechanism composed of a wheel on an axle or shaft. A rope, or cable usually runs over the wheel and inside the groove. Pulleys are normally used to change the direction of an applied force to make the work easier. It is one of the six simple machines.

500 Questions

Is a blender a pulley?

User Avatar

Asked by Wiki User

No

What is the simple machine a pulley?

User Avatar

Asked by Wiki User

A pulley is a simple machine that consists of a wheel with a groove and a rope or cable that runs through the groove. It is used to change the direction or magnitude of the force applied to lift or move objects. By reducing the amount of force needed to move the object, pulleys make it easier to perform tasks.

What is a fixed pulley used for?

User Avatar

Asked by Wiki User

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.

How many types of pitbulls are there?

User Avatar

Asked by Wiki User

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...

What is a pulley used in the kitchen?

User Avatar

Asked by Wiki User

i have no idea

ok ok its used for stirring

How do you install power steering pulley on Taurus?

User Avatar

Asked by Wiki User

Installing power steering requires purchasing a new steering rack, pump, and lines. The system has to have a power steering capable rack installed, the reservoir and lines need to be placed comfortably in the engine bay. After installation the system will need to the bled.

How compound pulley make your work easier and fast?

User Avatar

Asked by Wiki User

With Physics; less work to lift heavy objects.

How was the pulley made?

User Avatar

Asked by Wiki User

the pulley is mde by many things more like long thik streng and hard medal and long things that coneecent thought the same derecstion and faces the same way but that's the same thing thought oky bey

ask moer later

the pulley is mde by many things more like long thik streng and hard medal and long things that coneecent thought the same derecstion and faces the same way but that's the same thing thought oky bey

ask moer later

How do you build a small porch and steps?

User Avatar

Asked by Wiki User

The construction of handrails will depend on several things.

Are there walls to support the rails or do you need to create supports like balusters coming from the ground or step level?

If there are walls, you may just need brackets on the wall to which you can fix the handrails. These brackets will be metal, and many proprietary styles can be bought. If the brackets are to fix to timber they are easily screw fixed, and to stone wall they can be epoxy-resin glued. Check this before buying.

Do you want metal or wooden rails? This may affect the brackets you choose. If you need to construct baluster supports for the handrails, these can be timber or metal, and should be chosen to complenment the style of the building. All supports and the rail need to be designed to take the load of a person grabbing it during a fall. This can be quite a load.

A safe and comfortable rail has a diameter of about 40mm and is 900-1000mm (0.9-1m) above a line drawn joining the step nosings.

How do you remove crankshaft pulley itself after removed 22ml bolt still cant budge the bastard?

User Avatar

Asked by Wiki User

You will probably need to use a puller. There should be threaded holes on either side of the center hole. It needs to be the H type of puller, not one that grabs around the outside rim. That kind will pull the pulley apart.

How do you release the tension on the serpentine belt pulley of a 1996 Cadillac eldorado?

User Avatar

Asked by Wiki User

1) Rotate drive belt tensioner mechanism upward, away from drive belt using a 1/2 inch breaker bar. 2) Remove serpentine drive belt. 3) Reverse procedure to install.

How many types of wood are there?

User Avatar

Asked by Wiki User

go to this web i think that is the answerhttp://www.foe.co.uk/campaigns/biodiversity/resource/good_wood_guide/wood_timber_types_a_to_g.html i hope

What is the function of a sewing machine pulley?

User Avatar

Asked by Wiki User

what is the function of a pulley in a sewing machine

How do you lace a shoe?

User Avatar

Asked by Wiki User

To lace a shoe

Lace shoes come with pre-made eyelets (holes) to accept a shoe lace. There can be anywhere from 2 to 14 eyelets, but the average is 6 to 8 on regular tennis shoes. The holes are on both sides of the shoe's topmost fabric or leather.

Laces are fed through the holes, so that the center point of the "string" (lace) sits on the center-top of the foot. If it is not centered, the 2 ends will be uneven and it will be harder or impossible to make a bow.

Laces are started in the holes farthest away from the body. This is because a human needs the tied lace as close to the top of the foot near the ankle for the shoe to be comfortable and to stay on the feet.

Laces can be fed through the holes underneath (most used), or over the holes (less frequently used). From under, you'd lift the center fabric away from the tongue of the shoe, then put the lace beneath the hole and pull it through. You'd do the same on the other side. From over the holes, you'd just feed the lace down through the hole (one end to each side). Whichever way you pick (over or under), you'd continue the same method for each hole, both sides.

As you lace into one side, the lace is taken across the foot to the matching opposite eyelet, then pulled through there. Once 4 holes are "filled", you'll see that it creates an "X" effect on the shoe, over the shoe's tongue. This "X" pattern will continue as you proceed to cross the lace to the opposite side, and continue upward toward the ankle. (Note: This same criss-cross effect is used on sandals that have leather straps or strings that criss-cross up the calf toward the knee.)

Once the lace is fed through the holes, check again that the 2 ends have an equal or almost equal length. If unequal, you can lift the laces and pull the longer lace back through until the end-lengths are even.

To tie a shoe lace

Tying of laces is a skill generally learned between kindergarten and about 3rd grade, because it requires hand-eye coordination and dexterity that is lacking before that age. However, it is a skill that takes practice and some adults still struggle with the task.

Once the ends of the laces are fairly even, you'd take the string in your dominant hand and place it under the opposite side, drawing both sides toward the center of your foot. This is not knotted. Instead, it is a semi-snug cross over, leaving each lace end now on the opposite side of the shoe.

Holding each end snugly (as tight as comfortable), you now need to make a loop in the string that is held in your dominant hand. So if you are right handed, the loop will be on the right side string.

During these next steps, you will continue holding both strings / both sides, until finished making a bow.

With your index finger and thumb, you will hold the bottom of that loop, with your thumb and finger right on the shoe (at the last unknotted cross over). Now, take your opposite hand with the straight lace in your fingers and lay it in front of the loop of the other string. Draw the straight lace from the front of the other lace, around the back of the loop (so now the "straight" lace is completely around the loop on the other lace.

This next part is tricky when the task is first being learned. Still holding the loop between your thumb and index finger, you will make sure that the straight lace that goes around the loop is caught under your index finger, behind the loop. With the opposite hand, you will make a loop out of the remaining "straight lace".

At the top-center of your foot, at the base of the first "loop" with the cross-over of the opposite lace, you will take the index finger of your left hand and feel for a "hole" or opening where the 2 laces cross. While holding the 2nd loop you made with your thumb and index finger on the left hand, you will push that 2nd loop through the hole. While doing this, your right-hand thumb and index finger will be holding the first loop at it's base-- ideally, the first loop should be mostly upright, like a leaf sticking out. Keeping the first loop mostly upright helps keep it out of the way while your other hand's fingers finds that opening.

Once the opening is found with your left-hand's fingers, you will push the 2nd (left side) loop under / through the opening. Grab the loop (top) section / ends of both loops, one in each hand, between the thumbs and index fingers, and pull the 2 loops into a bow.

Some people prefer a single bow. Here, there is one bow, with the 2 laces hanging, one on each side of the foot. The ends should only hang about 1/2 way to the ground (or 1/2 way from the top of your foot to the bottom of your shoe).

Other people prefer a double bow. A double bow is also helpful if the shoe strings (laces) are too long for the shoe. To make a double bow, first make the original bow as described above. Then, in the right thumb/index finger, grasp the bow and extra string on the right. Do the same with the left hand for the left side bow and excess string. Make a second bow, using the same steps as described above. The second bow will sit directly on top of the first bow.

Undoing a single bow tied shoe lace

To undo a single bow tied shoe lace, you'd pick one (not both) side, grasping the excess single string (lace) between your index finger and thumb using your dominant hand. Leave the bow and loops free from touch. Swiftly pull the string in one motion, away from the foot (which is away from the bow also). This will undo the bow.

Slip your fingers under the last "loose" cross-over and pull each lace so the right lace is back on the right side of the foot, the left lace is now back on the left side of the foot (just like right after you had finished doing the eyelets).

If you can, just slip your foot out of the shoe. If you need more room for your foot to slip out of the shoe, gently pull the first "X" cross over nearest the top of your foot. Lift, but don't pull the laces out of the eyelets. You can loosen one or more "X" lacings, whatever you need to ease your foot from the shoe.

When shoes are stored, take the lace ends and lay them inside the shoe opening. This helps keep the laces cleaner and removes the temptation a pet might have to play with the laces.

Undoing a double bow tied shoe

Undoing a double bow tied shoe requires loosening the top bow, and undoing it first. If not done properly, the first and second bow will end up creating a knot in the shoe laces. After undoing the second bow, undo the first bow as described above.

How do you remove the belt tensioner on a 1997 Buick LeSabre?

User Avatar

Asked by Wiki User

The 1988 Buick Skylark 2.3 liter engine serpentine belt tensioner pulley is held in place with a single retaining bolt. The retaining bolt will be in the center of the pulley. Remove the retaining bolt.

What household items are made of a pulley?

User Avatar

Asked by Wiki User

Opening and closing blinds, the little string that you pull on are known as pulleys (:

What simple machines was used to build the Parthenon?

User Avatar

Asked by Wiki User

a big driller lol :P

What is the disadvantage of adding more pulleys to a system of pulleys?

User Avatar

Asked by Wiki User

There are two disadvantages:

  1. You will have to pull the rope a long distance to move the load a relatively short distance.
  2. There will be more loss of energy to friction with more pulleys.

What are the parts of an elevator and how do they work?

User Avatar

Asked by Wiki User

buttons and the ropes and pulley system so the elevator goes up if it gets pulled by the pulley system oh and i am in elementary school and i can answer it

Why is a block and tackle useful?

User Avatar

Asked by Wiki User

A block and tackle magnifies the pulling force applied to rope.

This is useful for moving heavy objects, lifting heavy objects, etc.

A good Example is all the old sailing ships like in The movies "Pirates of the Caribbean" used block and tackle to move and trim the sails.

This is still in use by window washers on skyscrapers to exercise machines.

Is a block and tackle pulley a compound machine?

User Avatar

Asked by Wiki User

no but a first class lever is

Which pulley system can make work easier?

User Avatar

Asked by Wiki User

A pulley halves the force required to lift a load, but doubles the length of rope or cable. So if you had a 10lb. weight attached to a rope, and were pulling the rope upward, you would need 10lbs. of force to lift it. However, if you had a pulley attached to a beam overhead, and were pulling down on the rope, you would only need 5lbs. of force to move the weight, but you would need to pull twice as much rope to get the weight to move the same distance.

What uses compound pulleys?

User Avatar

Asked by Wiki User

4 different types of pulleys?

User Avatar

Asked by Wiki User

The different types of Pulley Systems include:

  • Fixed
  • Movable
  • Compound