Work is defined as the transfer of energy via force to an object. It can be positive or negative. When a person or machine exerts a force on an object, it will change the direction and distance of the object. The magnitude and direction of the force will determine how much work is done. If a person or machine exerts a large amount of force over a long period of time, there will be less work than if the force were applied for a short period of time.
A force is a vector quantity. This means that it has both magnitude and direction. For example, a centripetal force exerted by a string inwards will make a ball circular. However, if the force is exerted in the opposite direction, the ball will not move. So, a centripetal force does not contribute to the work of the Atwood machine.
Work is measured in units known as joules. One joule is equal to one newton (N) of force applied to an object moving through a one meter (m) area. This unit of work is named after the 19th century English physicist James Prescott Joule. There are many non-SI units of work, including foot-poundal, calorie, litre-atmosphere, horsepower-hour and kilowatt-hour.
To calculate the total amount of work that has been done, it is necessary to know the angle between the force and the displacement. This is called the angle measure. In order to do this, you will need to know three variables.
First, you must know the magnitude of the force. Secondly, you must also know the angle between the displacement and the force. Thirdly, you must know the path along which the velocity of the force is defined. You can then multiply the length of the path by the force component to find the total amount of work.
When the angle of the displacement and the force is known, the work that has been done is measured in joules. For example, the difference in the distance that a teacher holds a book and the distance that it travels is a joule of work. Similarly, when a truck is moved, the force exerted on it is a joule.
Whether or not the magnitude of the force is greater or smaller is not necessarily important. What is important is whether or not the displacement of the object is in the same direction as the force. Otherwise, the object would not be moving. On the other hand, if the displacement is in the opposite direction, the work will be negative.
Lastly, you must understand how the work is done. Unlike the examples listed above, an everyday example of work does not involve the use of a machine. Therefore, the concept of work is a bit more complex.
In addition to this, the relationship between force and displacement is also quite complicated. Unlike the example above, there is not a simple mathematical equation for calculating the work of a machine. Instead, there is a complex formula that requires the knowledge of several factors.
