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NCERT Textbook Work, Energy & Power - Science & Technology for UPSC CSE
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FAQs on NCERT Textbook Work, Energy & Power - Science & Technology for UPSC CSE
| 1. What is work and how is it defined in physics? |  |
Ans. In physics, work is defined as the transfer of energy that occurs when a force causes an object to move in the direction of the force. Mathematically, work is given by the equation W = F * d * cosθ, where W is the work done, F is the applied force, d is the displacement of the object, and θ is the angle between the force and displacement vectors.
| 2. What are the different forms of energy discussed in the textbook? | |
Ans. The textbook discusses several forms of energy, including kinetic energy, potential energy, mechanical energy, thermal energy, chemical energy, and electrical energy. Kinetic energy is the energy possessed by a moving object, while potential energy is the energy stored in an object due to its position. Mechanical energy is the sum of an object's kinetic and potential energies.
| 3. How is power defined and what is its unit of measurement? | |
Ans. Power is defined as the rate at which work is done or the rate at which energy is transferred. Mathematically, power is given by the equation P = W / t, where P is the power, W is the work done, and t is the time taken. The unit of power is the watt (W), which is equivalent to one joule of work done per second.
| 4. What is the principle of conservation of energy? | |
Ans. The principle of conservation of energy states that energy cannot be created or destroyed, but it can only be transformed from one form to another or transferred from one object to another. In other words, the total energy of a closed system remains constant over time. This principle holds true for all types of energy discussed in the textbook, including mechanical, thermal, and chemical energy.
| 5. How is the efficiency of a machine calculated? | |
Ans. The efficiency of a machine is calculated by dividing the useful output or work done by the machine by the total input or energy supplied to the machine. Mathematically, efficiency is given by the equation Efficiency = (Useful output / Total input) * 100%. The efficiency of a machine is always less than 100% due to factors such as friction and heat losses.
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