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Conservation of Energy


The term conserved is normally known  when there is no loss or gain in the system. Energy is that what makes the body to do work. The energy manifests as work and thus transforms the form. That  gives you a different form of energy but the energy content having will be the same. This is what Conservation of energy concept tells about!

Law of Conservation of Energy

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The Law of Conservation of energy states that the total energy of an isolated system remains constant regardless of changes within a system.

In any Isolated system if no external force acts the total energy in the system remains constant regardless of changes within the system.
Total Energy = K.E + P.E
If mgh is the P.E and $\frac{1}{2}$ mv2 is the K.E in a system then
mgh = $\frac{1}{2}$ mv2
Here m is mass, g is gravity, h is height and v is the velocity in a system.

Conservation of Energy Formula

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Law of conservation of energy states that:

Energy can neither be created nor be destroyed but can be transformed from one form to another. In simple words it tells that
Energy lost in any act = Energy gained in that act

Lets illustrate it using a simple pendulum. At above three points on the pendulum the velocity varies
At point A the bob will be at rest hence velocity v = 0.
Total Energy = K.E + P.E
                     = 0 + mgh
                     = mgh

At point M the bob will be at maximum velocity then gradually decreases as it reaches the extreme.
Total Energy = K.E + P.E

                     = $\frac{1}{2}$ mv2 + 0

                     = $\frac{1}{2}$ mv2

At point B the bob will be at extreme. Hence the velocity will be at minimum.
Total Energy = K.E + P.E
                     = 0 + mgh
                     = mgh

Thus it concludes that energy total energy at both the extreme points are same. Hence the energy in a system remains constant.

How to Conserve Energy?

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Energy is that manifests as work. So get the work done you need to have a lots of energy. There is a rising demand for energy resources as the day is passing. You could see lot of energy resources getting wasted around you. So here are some tips to overcome it:

Usage of energy only for basic needs:
You need many devices like television, air conditioner, electric bulb, music player etc as your basic needs. Turn off these electrical devices like when not in use hence maintaining properly saves a lot of energy.

Avoiding over usage:
Over heating the water leads to loss of energy and it will take even time to cool it back. Overflowing of milk due to excess boiling that wastes the energy and milk as well. Carelessly handling while adding the petrol in the vehicle even wastes the petrol.

Natural energies usage:

Use the natural source of energy like solar energy, wind energy, hydro power etc. The solar sources like solar water heaters, solar cookers, solar bulbs save your electrical energy by limiting the use of electrical devices. The fossil fuels like coal, petrol and diesel can be replaced by the renewable sources.

Examples of Conservation of Energy

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There are many examples of potential energy you notice everywhere:

Hydroelectric Power: You could see water that produces electricity. The rain water falls from the sky. Since it falls from the height that converts potential energy to kinetic energy. This logic is used to rotate the turbine in a generator and gives out electricity. In this way the potential energy in the falls and dams are used as electricity.

Moving Kinetic energy:
  • A moving car Hits a wall. It leads to scratches in the layers of the wall. Here moving energy is transferred to the wall.
  • A guy running collides with another guy. It makes the another guy to fall. Here kinetic energy of first guy is transferred to another.
  • When you push a book across the table, the energy from your hand is transferred from to the book that makes the book to move.