Question

What are some examples of the principle of conservation of energy?

Answer 1

Hint: The principle of conservation of energy states that energy can neither be created nor be destroyed; it can only be transformed from one form to another. This conservation of energy is seen in many daily phenomena and nature also follows conservation of energy.

Complete answer:
Let us know consider some examples of principles of conservation of energy.
When ball falls from top of building under gravity to the ground then it follows conservation of energy i.e. Potential energy of the ball at the top changes into kinetic energy at the ground.
SOLAR PANELS: They do not create energy of their own they use the solar energy from converts it into electrical energy. They also follow conservation of energy.
BULBS: They transform electrical energy into light and heat energy.
DAMS: when water falls from height the potential energy converts to kinetic energy, this kinetic energy is further used to rotate the turbine which means mechanical energy and thus producing electricity energy.
LOUDSPEAKERS: It transforms Sound energy into electrical energy then amplifies it and produces sound energy.
AUTOMOBILES use conservation of energy.
Cells/batteries also use the law of conservation of energy; they convert chemical energy into electrical energy.
When a bullet fires with some velocity and hits the ice cake then some of the ice cake will melt then the kinetic energy of the bullet changes in Heat energy. This heat energy only melts the ice which means only the state is changed so we can call it Latent heat.
In conservation of energy, energy may always convert from one form into another but total energy of the system always remains constant. Many concepts of physics also follow the law of conservation of energy generally in the study of heat and thermodynamics we will follow such conservation.

Note:
If some resistive force is acting on the system then some energy is lost in doing work against that resistive force. Generally some of the energy is lost in friction and air resistance.
Second law of thermodynamics is also based on the law of conservation of energy and follows it under any process of thermodynamics.