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FAQs on Work Power and Energy - Theory sheet, Class 11 Physics

1. What is the formula for calculating work?
Ans. The formula for calculating work is given by W = F * d * cos(theta), where W is work, F is the magnitude of the force applied, d is the displacement, and theta is the angle between the force and displacement vectors.
2. How is power related to work and time?
Ans. Power is the rate at which work is done or energy is transferred. It is calculated by dividing the amount of work done by the time taken. The formula for power is P = W / t, where P is power, W is work, and t is time.
3. What is the principle of conservation of energy?
Ans. The principle of conservation of energy states that energy cannot be created or destroyed; it can only be transferred or transformed from one form to another. In other words, the total energy of a closed system remains constant over time.
4. What is the difference between kinetic energy and potential energy?
Ans. Kinetic energy is the energy possessed by an object due to its motion. It is given by the formula KE = 1/2 * m * v^2, where KE is kinetic energy, m is the mass of the object, and v is its velocity. Potential energy, on the other hand, is the energy possessed by an object due to its position or condition. It can be gravitational potential energy, elastic potential energy, or chemical potential energy, depending on the situation.
5. How is the work-energy theorem related to the concept of work and energy?
Ans. The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy. It mathematically expresses the relationship between work and energy. According to the theorem, the net work done on an object is equal to the change in its kinetic energy. This theorem provides a convenient way to analyze the motion of objects and understand the transfer of energy between different forms.
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