Pulleys

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.

An example of a combined pulley system is a block and tackle, where multiple pulleys are used together to increase mechanical advantage, making it easier to lift heavy loads. This system is commonly used in sailing to hoist and control sails.

The mechanical advantage of a combined pulley system is equal to the number of supporting ropes or lines attached to the moving pulley or block. For example, a system with two supporting lines would have a mechanical advantage of 2, making it easier to lift a heavy load. The mechanical advantage allows for less force to be exerted to lift a heavy object.

A fixed pulley is stationary and changes the direction of force, while a movable pulley moves with the load and provides a mechanical advantage by distributing the force over multiple ropes. Fixed pulleys have a single attachment point, while movable pulleys have two attachment points—one fixed and one moving.

They put a rope over one axle, and attach the other end to the weight, and this increases the distance. The formula for a fixed pulley is

length of effort arm

-------------------------

length of resistance arm

recommend please

To calculate the input force needed to lift a stone slab weighing 2500 N with a mechanical advantage of 10, you would divide the weight of the slab by the mechanical advantage. So, the input force required would be 250 N (2500 N / 10).

When two pulleys work together, it is called a pulley system or a block and tackle system. This arrangement allows for mechanical advantage by distributing the load between the two pulleys, making it easier to lift heavy objects.

A motor pulley car science project typically involves attaching a small motor to a car chassis, with a pulley system to drive the wheels. By adjusting the size of the pulley, you can explore how different gear ratios affect the speed and torque of the car. This project demonstrates basic principles of mechanical advantage and gear systems in a hands-on way.

The pulley is like a wheel with a string going on one side going up and around then down the other side. When you pull one side it lifts the load that is on the other side rises and when you let go the load dropps. PEACE OUT! ={)

It can pull something that may be very heavy too.This is the benefit of a pulley that it can pull heavy things because it has pulley that increases the amount t=of the pull or force that is being applied.

A fulcrum is a fixed point on which a lever pivots. It allows the lever to rotate around it, enabling the lever to lift or move objects with less force. In simple terms, the fulcrum helps to magnify the force applied to one end of the lever to lift or move objects on the other end.

It is a rope fitted around the rim of a fixed wheel. Some pulleys increase the force that is applied to them .Other change the direction of the force.They are used to raise and lower things such as elevator cars.
It is just that - a pulley.

The three types of pulleys are fixed pulleys, movable (or movable) pulleys, and compound pulleys. Fixed pulleys change the direction of the force applied, movable pulleys provide a mechanical advantage by reducing the force needed, and compound pulleys combine fixed and movable pulleys for increased mechanical advantage.

A disadvantage of a fixed pulley is that it does not provide any mechanical advantage, meaning it does not change the direction or magnitude of the force applied. This can make it challenging to lift heavy loads without additional force.

A fixed pulley does not provide any mechanical advantage, meaning it does not reduce the amount of force needed to move an object. Additionally, it changes only the direction of the force applied, not the magnitude.

Some examples of pulleys include clothesline pulleys, flagpole pulleys, and elevator pulleys. Pulleys are simple machines that consist of a wheel with a groove around its circumference and a rope or belt that moves around the groove to lift or lower objects.

The method to calculate mechanical advantage is easy to remember and is necessary when rigging the assembly to accomplish the job. The mechanical advantage of a rigging that will require upward pull can be determined by counting the number of rope lengths running between engaged pulleys and those doing the work. Likewise, if the assembly will require downward pull, count the ropes and subtract one to get the mechanical advantage number. The subtraction is necessary because with the fixed pulley, the downward pull equals the load on the other length of rope so the last "pull" rope does not provide any mechanical advantage.