drive the expression of Total energy when the object of stationary point A.
Answers
Explanation:
Energy:
An object possesses energy when it has a capability to do work. Activities like cooking food, dancing on music, singing a song requires energy. Life is impossible without the enrgy. Sun is the biggest natural source of free energy.
An object that possesses energy can exert a force on another object and energy is transferred from the former to the latter. The second object move as it receives energy and therefore do some work. This implies that any object that possesses energy can do work.
Unit of energy = joule
Forms of energy:
The various forms of energy includes
· Mechanical energy – Kinetic energy and potential energy
· Heat energy
· Chemical energy
· Electrical energy
· Light energy
Kinetic energy:
When object is in motion, it possesses energy that is called as kinetic energy. Activities like riding horse, driving car, rolling stone, flying plane are the examples of kinetic energy. The kinetic energy of an object increases with its speed.
Consider an object of mass m moving with a uniform velocity u. Let is now be displaced through a distance s when a constant force F acts on it in the direction of its displacement. Now, work done on the object is
W = F s -------------------(1)
Work done on the object causes a change in its velocity v and the acceleration of an object is a, then,
………………………(2)
Now force F = ma ………………………(3)
Applying 2 and 3 in equation 1,
IF an object is starting from its stationary position, that is u = 0, then
Equation shows that work done is equal to the change in the kinetic energy of an object (Ek).
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