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Lbf Muc Convert pound-force inch [lbf·in] to pound-force foot [lbf·ft] Video(4K) 20+ Minutes of busy Plane spotting at Munich airport (MUC/EDDM) - February 2020
A wrench is designed in such a way that if the right size is chosen, no additional force is necessary for gripping.
When using pliers, however, one needs to apply force to bring the two handles closer together and grip the object, in addition to the force needed to rotate this object.
Therefore wrenches are more energy-effective for many applications. In some cases, pliers are better, however, because they allow one to vary the size of the object being gripped.
They can also more easily be used at an angle. Applying force at an angle may decrease the torque, but it is useful in situations when the object being rotated is hard to reach.
Rubber grip tools that help with opening tightly-closed jars are similar to wrenches. The rubber grip is not related to torque, it simply prevents the tool from slipping off the lid.
The handle does increase torque, however. The longer this handle — the more our initial force is magnified. A flywheel is a good example of a device that uses torque to generate energy, that is then stored within the flywheel for further use.
The torque increases the speed at which the wheel rotates and increases the stored energy. When the energy is needed, torque is applied again to slow down the rotation and the energy is released.
These devices are useful when the energy supply is not continuous — they can provide energy when the original energy supply dwindles.
A vehicle engine is a good example of this. In the engine, the energy released through burning the fuel comes in bursts, and the flywheel collects it and ensures a constant supply.
In some cases the opposite is necessary. Flywheels also allow releasing an amount of energy larger, than the original source can provide.
In this case, the energy is stored gradually and then released in a burst, when needed. When two people sit on a seesaw, their weight is the force that makes the seesaw move up and down, by partially rotating about its center.
Children of the same weight can play on the seesaw easily if they sit roughly the same distance away from the fulcrum.
It is not so easy for children, whose weight differs significantly, because the heavier child would bring the seesaw down and the lighter child up.
In this case, the lighter child would not be able to push the seesaw back down. This is because the bigger child produces more torque.
To counter this, the heavier child could balance torque with the lighter child by moving closer to the center of the seesaw.
For example, the bigger child who is three times heavier than the smaller child should sit three times closer to the center of the seesaw to ensure balance.
The levers operate on a similar principle: torque plays a role in helping reduce the amount of force needed to perform a given task.
Generally, a lever is a long object, like a plank or a handle, that rotates about a point called fulcrum. A force is applied to the lever at a specific point, and it is then either magnified or minimized, depending on the construction of the lever and on the needs of the person, using the lever.
There are three types of levers, depending on where the force is applied, where the output force is directed, and where the fulcrum is located.
Usually, they are referred to as class one, class two, and class three levers. Often the force applied to the lever or the input force is called the effort , while the output force is often referred to as the resistance.
This word is chosen because indeed, the output force resists the effort. For example, if you try to lift a load using a lever, the weight of the load will resist the input force or the effort, but if the effort is strong enough, then the resulting force will produce the work required.
Our own bodies, as well as bodies of other animals also use the same principles and operate some body parts as levers, to minimize the energy needed to perform certain tasks, as we will show in examples below.
Class one levers are similar to seesaws in their construction. The fulcrum is located in the middle. The effort is on one end, while the resistance is on the other end.
The fulcrum for the levers in class two is located on one end of the lever, the effort is applied at the opposite end, and the resistance is close to the fulcrum, with the direction, opposite of the effort.
The design of class three levers is the opposite of the construction of class two levers. The fulcrum is still on one end of the lever, but the force closest to it is the effort, while the force on the other edge, acting in the opposite direction of the effort, is the resistance.
Some scales, balanced in the middle, operate as class one levers. Scissors are a combination of two class one levers; they allow us to cut thick materials that may be difficult to cut with a knife, for example.
The length of the handles allows decreasing the magnitude of the force, necessary for cutting. Conversely, placing the object to be cut further away from the pivot, which is the fulcrum, makes it more difficult to cut.
Scissors or shears, meant to cut thicker and harder materials like branches or sheet metal, often have longer handles to increase the torque.
In some cases, a spring is added to the design for mechanical advantage. Some specialized scissors have additional features.
For example, trauma shears, meant to cut clothes away from the body of an injured person, have blades with rounded edges, to prevent injury to the skin.
A slug has a mass of In some contexts, the term "pound" is used almost exclusively to refer to the unit of force and not the unit of mass.
In those applications, the preferred unit of mass is the slug , i. In other contexts, the unit "pound" refers to a unit of mass.
The international standard symbol for the pound as a unit of mass is lb. In the "engineering" systems middle column , the weight of the mass unit pound-mass on Earth's surface is approximately equal to the force unit pound-force.
This is convenient because one pound mass exerts one pound force due to gravity. The SI is an "absolute" metric system with kilogram and meter as base units.
The term pound of thrust is an alternative name for pound-force in specific contexts. It is frequently seen in US sources on jet engines and rocketry, some of which continue to use the FPS notation.
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