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 The essential conditions to be satisfied for work to be done are: |
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Some force must act on the object. |
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The point of application of force must move in the direction of force. |
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W = F x s |
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SI unit of work is joule. |
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Energy is the capacity to do work. |
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The two types of mechanical energy are kinetic energy and potential energy. |
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Kinetic energy is the energy possessed by an object by virtue of its motion. |
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Potential energy is the energy possessed by an object by virtue of its position or condition. |
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| Kinetic energy = 1/2 mv2 |
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| Potential energy = mgh |
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Law of conservation of energy states that energy can neither be created nor destroyed but can be transformed from one form to another. |
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Power is the rate of doing work. |
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SI unit of power is watt. |
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Escape velocity is the minimum velocity with which a projectile is thrown into space in order that it escapes the gravitational pull of the earth and never returns to the surface of the earth. |
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