1}. Define work with its unit in which condition work will be zero. – [3M]
2}. Define energy and power with its unit. – -[2M]
3}. Define kinetic energy and potential energy with it's proved equation. –[4M]
4}. Write Commercial Unit of energy. –[3M]
5}. Scientific concept of work. Explain. –[2M]
6}. Short Note On Law Of Conservation Of Energy. –[3M]
Answers
★ Answer ★
1. When a force is applied to a body and there is displacement of the body, work is said to be done. The SI unit of work is joule (J). Zero work, When force and displacement are perpendicular to each other, or when force or displacement is zero.
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2. Power is the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is joules per second (J/s).
Energy is the capacity of a physical system to perform work. The SI unit of energy is the joule (J) or newton - meter (N * m).
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3. Kinetic energy of an object is the measure of the work an object can do by virtue of its motion.
- K.E = 1/2mv²
The energy possessed by virtue of its position is said to be potential energy.
- P.E = mgh
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4. Commercial unit of energy is Kilowatt - hour. 1 kWh is the amount of energy consumed by an electrical gadget in one hour at the rate of 1000J/Second or 1kW.
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5. For a work to be done, in a scientific sense, a force must be exerted and there must be displacement in the direction of the force. With this said, we can say that
Work is the product of the component of the force in the direction of the displacement and the magnitude of this displacement.
Mathematically, the above statement is expressed as follows:
W = (F.S.cosθ) = F.S
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6. The law of conservation of energy states that energy can neither be created nor destroyed but can only be converted from one form to another. According to the law of conservation of energy, the total energy of an isolated system remains conserved over time.
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CreativeAB
• The Genius •