Mechanical Energy


 
 
Concept Explanation
 

Mechanical Energy

Mechanical Energy

Energy in an object which can create some motion in the object is known as mechanical energy. Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. There are two forms of mechanical energy that is kinetic energy (energy due to motion) or potential energy (energy due to the position). Mechanical energy of an object can be calculated as the sum of the kinetic energy and the potential energy of an object.

Kinetic energy : 

Energy possessed by a body by virtue of its state of motion is called kinetic energy. A moving bus, a rolling ball are some examples of kinetic energy.

Potential energy : 

 Energy possessed by an object due to its position is called as potential energy. A stretched rubber band, a catapult are some examples of potential energy

For example :

The kinetic energy of an aeroplane at rest is zero. As the aeroplane is standing at the ground level its potential energy is zero on the ground. Then, its mechanical energy which is the sum of kinetic energy and potential energy is zero while it rests on the ground. When the same aeroplane flies, it has kinetic as well as potential energy. Their sum gives the aeroplane's mechanical energy in flight.

Conservation of Mechanical Energy :

The total mechanical energy of a system is conserved i.e. energy can neither be created nor destroyed , it can only be converted from one form to other. 

                                      K.E. + P.E.  =   constant

Sample Questions
(More Questions for each concept available in Login)
Question : 1

An object possesses a potential energy of 10 J and kinetic energy of 5 J . The mechanical energy in an object will be _______________

Right Option : C
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Explanation
Question : 2

An object possesses a mechanical energy of 620 J and kinetic energy of 130 J . The potential energy in an object will be _______________

Right Option : C
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Explanation
Question : 3

A flying aeroplane has ________________

 

Right Option : C
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Explanation
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