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Mindmap: Work and Energy | Science Class 9

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1. What is work and energy?
Ans. Work is defined as the transfer of energy that occurs when a force is applied to an object and the object is displaced in the direction of the force. Energy, on the other hand, is the capacity of a system to do work or produce heat.
2. How is work calculated?
Ans. The work done on an object can be calculated by multiplying the force applied to the object by the displacement of the object in the direction of the force. Mathematically, work (W) is given by the equation W = F × d, where F is the force applied and d is the displacement.
3. What are the different forms of energy?
Ans. Energy can exist in various forms, including kinetic energy, potential energy, thermal energy, chemical energy, electrical energy, and nuclear energy. Kinetic energy is the energy of motion, while potential energy is the energy that an object possesses due to its position or condition.
4. How is power related to work and energy?
Ans. Power is the rate at which work is done or energy is transferred. It is calculated by dividing the work done or energy transferred by the time taken to do the work or transfer the energy. Mathematically, power (P) is given by the equation P = W/t, where W is the work done or energy transferred, and t is the time taken.
5. What are some real-life examples of work and energy?
Ans. There are numerous examples of work and energy in our daily lives. Some common examples include lifting objects, running, driving a car, using electrical appliances, and cooking. In all these instances, work is being done and energy is being transferred or transformed from one form to another.
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