The mechanical energy of a hammer gives the hammer its ability to apply a force to a nail in order to cause it to be displaced. Because the hammer has mechanical energy in the form of kinetic energy , it is able to do work on the nail. Mechanical energy is the ability to do work.
Another example that illustrates how mechanical energy is the ability of an object to do work can be seen any evening at your local bowling alley. The mechanical energy of a bowling ball gives the ball the ability to apply a force to a bowling pin in order to cause it to be displaced.
Because the massive ball has mechanical energy in the form of kinetic energy , it is able to do work on the pin. A dart gun is still another example of how mechanical energy of an object can do work on another object. When a dart gun is loaded and the springs are compressed, it possesses mechanical energy. The mechanical energy of the compressed springs gives the springs the ability to apply a force to the dart in order to cause it to be displaced.
Because of the springs have mechanical energy in the form of elastic potential energy , it is able to do work on the dart.
A common scene in some parts of the countryside is a "wind farm. The mechanical energy of the moving air gives the air particles the ability to apply a force and cause a displacement of the blades. As the blades spin, their energy is subsequently converted into electrical energy a non-mechanical form of energy and supplied to homes and industries in order to run electrical appliances. Because the moving wind has mechanical energy in the form of kinetic energy , it is able to do work on the blades.
Once more, mechanical energy is the ability to do work. As already mentioned, the mechanical energy of an object can be the result of its motion i. The total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy. This sum is simply referred to as the total mechanical energy abbreviated TME.
As discussed earlier, there are two forms of potential energy discussed in our course - gravitational potential energy and elastic potential energy.
Given this fact, the above equation can be rewritten:. The diagram below depicts the motion of Lee Ben Fardest esteemed American ski jumper as he glides down the hill and makes one of his record-setting jumps. The total mechanical energy of Lee Ben Fardest is the sum of the potential and kinetic energies.
The two forms of energy sum up to 50 Joules. Notice also that the total mechanical energy of Lee Ben Fardest is a constant value throughout his motion. There are conditions under which the total mechanical energy will be a constant value and conditions under which it will be a changing value.
This is the subject of Lesson 2 - the work-energy relationship. Instead, it is simply transferred from one type of energy to another, or from one form of energy to another. The difference between mechanical energy and kinetic energy is that kinetic energy is a type of energy, while mechanical energy is a form of energy. Work can be defined as the process of energy transfer whereby a force acts upon an object to cause a displacement.
If an object is moved, then work has been performed. Work requires three things: a force, a displacement and a cause. For example, if you picked up a book and placed it on the top shelf of a bookshelf, the force would be you lifting the book, the displacement would be the movement of the book and the cause of the movement would be the force you applied.
There are two types of energy: potential and kinetic. Potential energy is energy that is stored in an object due to its position. This type of energy is not in use but is available to do work. For example, the book possesses potential energy when it is stationary on the top of the bookshelf.
Kinetic energy is energy that is possessed by an object due to its motion. For example, if the book were to fall off the shelf, it would possess kinetic energy as it fell.
All energy is either potential or kinetic. Mechanical energy is a form of energy. It represents the energy that is possessed by a mechanical system or device due to its motion or position. Stated differently, mechanical energy is the ability of an object to do work. Mechanical energy can be either kinetic energy in motion or potential energy that is stored.
The sum of an object's kinetic and potential energy equals the object's total mechanical energy.
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