WORK POWER ENERGY (OAPT)

# WORK POWER ENERGY (OAPT) - FUNDAMENTAL CONCEPTS OF WORK...

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FUNDAMENTAL CONCEPTS OF Work is said to be done when the application of a force produces a change in the body. The change may be in position, velocity, shape, chemical composition, temperature or colour of the object. Work is a scalar quantity (i.e. no direction is required) and the SI unit of work is the Joule ( J ). 1 1 1 1 2 2 J N m J k g m s = = The mechanical work done by a force is equal to the product of the component of the force along the direction of the motion of the object and the distance through which the point of application of the force moves. Mathematically, W F d W F d = = c o s θ where is the angle between the force and the displacement vectors. The work done can also be found using the area under a force versus displacement graph (regardless of the shape of the force–displacement function). Energy is the capacity (ability) to do work. The units of energy are the same as work. The energy possessed by an object by virtue of its motion is called kinetic energy . Mathematically, K m v = 1 2 2 . The energy possessed by an object die to its position or change of shape is called potential energy . When a body of mass m is raised through a vertical height h under the influence of gravity, then the body attains gravitational potential energy . Mathematically, U m g h = . Conservation of

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WORK POWER ENERGY (OAPT) - FUNDAMENTAL CONCEPTS OF WORK...

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