Pulleys

My heart felt as if being lifted up on strings by a pulley.

The mechanical advantage (MA) of a pulley system is calculated by counting the number of ropes supporting the moving block or load. For a single fixed pulley, the MA is 1 as it changes the direction of the force but does not provide any mechanical advantage. For a system with multiple pulleys, the MA is equal to the number of ropes supporting the load.

Assuming you know the difference between binary and decimal:

Binary:

1024K = 1MB

128MB * 1024KB = 131072KB (KB's in 128MB)

131072KB / 4 = 32768 (4KB's in 128MB)

Decimal:

1000K = 1MB

128MB * 1000KB = 128000KB (KB's in 128MB)

128000KB / 4 = 32000 (KB's in 128MB)

If you don't know the difference between binary and decimal, binary is exact values, decimal is the way things are marketed. (IE: A hard drive is marketed as 80GB when in reality you only get 78.125GB)

A single pulley changes the direction of the force needed to lift an object, making it easier to lift by allowing you to pull downwards rather than upwards. It does not reduce the amount of work needed, but it helps in exerting the force in a more convenient direction.

1. Elevators: Pulleys are used to raise and lower the elevator car by applying force over a distance.
2. Well systems: Pulleys are often used to draw water from wells by making it easier to lift the heavy bucket.
3. Construction cranes: Pulleys are utilized to lift and lower heavy building materials and equipment at construction sites.

A fixed pulley is a type of pulley that is attached to a stationary object, such as a ceiling or wall. It changes only the direction of the force applied to it, without providing any mechanical advantage. Fixed pulleys are commonly used to redirect the path of a rope or cable.

Some examples of simple machines that can help multiply speed include gears, pulleys, and levers. These machines work by trading off force for speed, allowing input forces to produce greater output speeds.

There are a total of three pulleys in the system.

No, a doorknob is not a pulley. A pulley is a simple machine that consists of a grooved wheel and a rope or belt that runs along the groove to lift or move objects. On the other hand, a doorknob is a type of door handle used to open or close doors.

Pulleys help in various ways today, such as lifting heavy objects in construction, moving loads in industrial settings, and providing mechanical advantage in exercise equipment. They help make work easier by reducing the amount of force required to lift or move objects.

Advantages - a pulley allows you to apply force in any direction, not just the one in which the force is to applied. Multiple pulleys yield a mechanical advantage that can allow the lifting of heavy weights.

Disadvantages - the pulley has to be securely anchored to support the mass being acted on, and the rope has to be strong and durable. A wheeled pulley needs to rotate smoothly, and a sliding (e.g. wooden) pulley should not abrade the rope. Also, the more pulleys you use, the more rope you need.

You need to consider the strength of the pulley's anchorage. If you try to raise a 40 lb load using a rope over a single pulley hung from the roof with the 2 legs of the rope parallel, the force on the anchorage will be 2 x 40 = 80 lbs.

The use of a pulley allows you to translate the direction of an applied force, for example to lift something by pulling sideways, or to use the force of gravity (e.g. body weight) against itself. You do not have to be moving in the same direction in which the force is to be applied.

90 goes into 5280 58 times.

A 1st class pulley is when the axis or fulcrum is located between the load and the effort. This type of pulley can change the direction of the force applied to lift an object. It is often used in flagpoles and some types of lifting systems.

I don't no

It is set in one position and cannot move.

apex :)

A pulley is a simple machine that consists of a wheel with a groove along its edge for holding a rope or cable. It is used to help lift or lower heavy objects by changing the direction of the force needed to move the object. Pulleys are often used in conjunction with other pulleys to create mechanical advantage and make lifting objects easier.

A block and tackle is a system of pulleys and ropes used to lift heavy objects with less effort. It works by distributing the load across multiple pulleys, allowing a person to pull with less force than the weight of the object being lifted. Block and tackles are commonly used in various industries for lifting and moving heavy loads.

For a pulley, when is it that the mechanical advantage is greater than 1 and when is it that it is equal to 1? If a rope was hung over a pulley with unequal weights applied to both ends, the larger weight (77kg) would pull the lesser weight (30kg) upward, and so what would the mechanical advantage there be?

The thing about this question is that if a rope were hung over a pulley and the tension at each point was the same (neglecting the mass of the rope and pulley), then how is it that if both ends of the rope point downward that the mechanical advantage becomes 2 (if there was just that one pulley)? Is the mechanical advantage any different if someone was applying a force to one end of the rope compared to gravity acting alone?

There are three main types of pulleys: fixed pulleys, movable pulleys, and compound pulleys. Fixed pulleys are attached to a surface and change the direction of the force applied. Movable pulleys are attached to the object being moved and reduce the amount of force needed. Compound pulleys combine fixed and movable pulleys for a mechanical advantage in lifting heavy loads.

we use pulleys and gears in our daily lives because it would make it easier for people to do our work.We would not have to work so hard.We use pulleys to lift heavy objects.We use gears to build stuff. That's why we see gears in some of our objects.(If you look at a egg beater,you will see gears in a egg beater).

Depends what the input force is and the mechanical advantage of the pulley system

If effort force (input force) is 20 pounds in a 6 pulley system (3 fixed,3 movable) then load force (output force) is 120 pounds

As 6 times 20 equals 120 pounds

The input force is the force applied to the pulley by the person or machine. The output force is the force exerted by the pulley to move the load. The output force is typically higher than the input force due to mechanical advantage.

hmm that's odd, i never thought of shoe laces in that matter.

But when giving some thought, i guess you can pull it off.

So a pulley system involves making a heavy object easier to lift by diverting most of the force to what is called the "pulley" usually hanging from somewhere with rope going through with the object attached on one side and the person pulling on the other.

It may be a cute little set up but i guess you can do the same thing with shoe laces, maybe use a little thread spool as the pulley. Just rig it up with the shoe lace through the spool. A little hard to describe with words. Heres a picture to better illustrate, http://en.wikipedia.org/wiki/Image:Pulle...

Hope that helped and have a good one,

A single pulley system consists of a wheel with a groove and a rope, allowing a force to be applied to lift or move an object. It changes the direction of the force applied, making it easier to lift heavy loads by distributing the force needed to lift the object.