energy work and power(उर्जा कार्य आणि बल)-mpsc science

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Intro of energy

➤Energy, in physics, the capacity for doing work.
➤ It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. There are, moreover, heat and worki.e., energy in the process of transfer from one body to another.
➤Units:joule and erg
➤ 1joule=10^7 erg

Kinetic energy

➤ Kinetic energy is a form of energy that an object or a particle has by reason of its motion.
➤ If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy
➤ K.E=1/2mv^2

potential energy

➤ potential energy is the energy that is stored in an object due to its position relative to some zero position.
➤ An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.
➤ P.E=mgh(m=mass,g=gravity,h=height)

Laws of conservation of energy

➤ Energy cant be created nor be destroyed but it can be convert from one form to another form.

Work

➤ Work, in physics, measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement.
➤ work=force*displacement
➤ work is a scalar quantity
➤ SI unit of Work is Joule.
➤ CGS unit of Work is erg.

Power

➤In physics, power is the amount of energy transferred or converted per unit time.
➤ In the International System of Units, the unit of power is the watt, equal to one joule per second.
➤ In older works, power is sometimes called activity. Power is a scalar quantity.
➤ SI unit: watt (W)

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