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Published byPhebe Angel Oliver Modified over 5 years ago

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WORK AND ENERGY

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Work Work is said to be done whenever the application of the force produces a change. A change can be the change in velocity position shape temperature

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ENERGY The ability to do work is called energy.

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Different Kinds of Energy Kinetic Energy Potential Energy

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Kinetic Energy The ability to do work based on motion is called kinetic energy

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Potential Energy The energy possessed by objects because of their position or shape.

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Identify Kinetic and Potential Energy

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An object can have both potential and kinetic energy. An aeroplane flying at a height has both potential and kinetic energy

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The sum of the potential and kinetic energies of an object is called mechanical energy.

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Energy can neither be created nor destroyed. It can only be converted from one form to another or transferred from one object to another. Rubbing Palms produces heat energy.

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Work- Formula How much work is done – depends on the force applied to produce the motion.

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The amount of work done Depends on The force applied to do the work. The distance travelled Therefore work done= force X distance

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Unit of Work Unit of Force- Newton Unit of Distance- Meter Therefore, the unit of Work= Newton- meter Newton-meter is also called Joule in the name of British scientist James Joule.

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Work done in lifting mass to a height Earth attracts the mass m with a force = mg g is the acceleration due to gravity. h is the distance through which the object has moved.

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Work done… Therefore the work done in raising the books of mass m to height h is mgh.

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