Pulleys

The actual mechanical advantage of a pulley system is calculated by dividing the output force by the input force. It is the ratio of the load force being lifted to the force applied to lift it. This value indicates how much the pulley system amplifies the force applied.

When you step into an elevator and close the door, you had passed through two doors and are now standing in a box (or the elevator car) inside a vertical passageway (called the lift shaft). One door is in the walls of the floor that you got off, and the other door is part of the car itself.

Inside the shaft are hoisting cables attached to the top of the car. The cables run over a sheave (pulley) connected to an electric motor at the top of the shaft. The other end of the cables is connected to a heavy steel weight called a counterweight. When the car goes up, the counterweight goes down; when the car goes down, the counterweight goes up.

How the counterweight reduces to a minimum the power needed to operate the elevator ...

Weight of counterweight = Weight of the car + (about) ½ of its maximum passenger load

So when the elevator operates, it needs power only to lift the weight of the extra passengers in the car; the rest of the weight is balanced by the counterweight.

The forces acting on a pulley are tension forces exerted by the ropes or cables pulling on it. These tension forces cause the pulley to rotate and transfer motion and forces between different parts of a system. Frictional forces may also act on the pulley, depending on the surface it is in contact with.

The pulley is believed to have originated in Mesopotamia around 1500 BC. It was used to lift heavy objects and was an important technological advancement in the field of mechanical engineering.

No, a window is not a pulley. A pulley is a simple machine that is used to change the direction or magnitude of a force, while a window is a transparent opening in a wall or door that allows light and air to enter a space.

Pulleys allow for the transfer of force and motion over a distance. They can help to lift heavy objects with less effort by distributing the weight to multiple ropes or chains. Pulleys also enable redirection of force, making it easier to change the direction of an object's movement.

Has a wheel and a rope around it to pull

A combined pulley system allows for the distribution of weight over multiple ropes, which can reduce the amount of force needed to lift an object. This type of system also offers increased mechanical advantage, making it easier to lift heavy loads. Additionally, combined pulleys can change the direction of a force, allowing for more versatile applications.

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.