WORK AND ENERGY
Two conditions need to be satisfied for work to be done: (i) a force should act on an object, and (ii) the object must be displaced.
Work done by a force acting on an object is equal to the magnitude of the force multiplied by the distance moved in the direction of the force.
Work has only magnitude and no direction.
Unit of work is newton metre (N m) or joule (J).
Work done is negative when the force acts opposite to the direction of displacement.
Work done is positive when the force is in the direction of displacement.
An object having a capability to do work is said to possess energy.
The object which does the work loses energy and the object on which the work is done gains energy.
Objects in motion possess energy which is known as kinetic energy.
The kinetic energy of an object increases with its speed.
the kinetic energy of a body moving with a certain velocity is equal to the work done on it to make it acquire that velocity.
kinetic energy of an object in the form of an equation.
The potential energy possessed by the object is the energy present in it by virtue of its position or configuration.
The potential energy of an object at a height depends on the ground level or the zero level you choose.
An object in a given position can have a certain potential energy with respect to one level and a different value of potential energy with respect to another level.
the sum of the potential energy and kinetic energy of the object would be the same at all points.
The sum of kinetic energy and potential energy of an object is its total mechanical energy.
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