4. Work, Energy and Power
This chapter covers the concepts of work, energy, and power, emphasizing their fundamental roles in physical processes. It explains work as the product of force and displacement and introduces various forms of energy, including kinetic and potential energy. Additionally, the chapter discusses the transformation of energy, the concept of power as the rate of doing work, and the efficiency of energy conversion in machines.
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What we have learnt
- Work is done when a force is applied and results in displacement in the direction of the force.
- Energy can be transformed between various forms, and the total energy in an isolated system remains constant.
- Power measures the rate of work done or energy transferred over time.
Key Concepts
- -- Work
- The product of force applied and the displacement of the object in the direction of the force.
- -- Energy
- The capacity to do work, measured in Joules.
- -- Power
- The rate at which work is done or energy is transferred, calculated as work done divided by time.
- -- Efficiency
- A measure of how effectively energy is converted from one form to another, expressed as a percentage.
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