Question

law of conservation of energy ?

Answer 1

Hey...
In Law of conservation of Energy-'Energy can neither be created nor be destroyed. It can be converted from one form into another. Thus, the total amount of energy in the universe remains constant'.
✔️Lets take an example
Make two pendulums of the same length with the help of thread and nuts. Tie another thread in the horizontal position.
#.. Tie the two pendulums in such a way that they will not hit Each Other while swinging. Now swing one of the pendulums and observe.
#.. You will observe that as the speed of oscillation of the pendulum slowly decreases, the second pendulum which was initially stationary, begins to swing. Thus, one pendulum transfer its energy to the another....
✔️I have tried to draw the experiment that u will understand it well...

Answer 2

$\huge{HEY!!}$
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⭕This law states that energy can neither be created nor destroyed. It can only be converted from one form to another.

⭕Suppose an object of mass m Falls freely from a height h.

⭕At the start, the potential energy is mgh and kinetic energy is zero. The kinetic energy is zero because its velocity is zero. The total energy of the object is mgh.

⭕As it fall, its potential energy will change into kinetic energy. 

⭕If V is the velocity of the object at a given instant, the kinetic energy would be 1/2 mv^2.

⭕As the fall continuous, potential energy would decrease while the kinetic energy would increase.

⭕When the object is about to reach the ground h = 0 and V will be the highest, the kinetic energy would be largest and the potential energy will be the least.

⭕However, the sum of the potential energy and kinetic energy of the object would be the same at all the points.

⭕Potential energy + Kinetic energy = Constant
mgh + 1/2mv^2 = constant. 

⭕The sum of kinetic energy and potential energy of an object is called the total mechanical energy.