Question

explain chapter work and energy

Answer 1

Work-
In our daily life anything that makes us tired is known as work. For example, reading, writing, painting, walking, etc.

In physics work (W) is said to be done, when a force (F) acts on the body and point  of application of the force is displaced (s) in the direction of force.

Work done = force x displacement

    W          =     F       x       s
(i) If the body is displaced in the same direction of force, Work done is positive

(ii) If the displacement is against a force, the work is done against the force. Work done is negative

(iii) If the displacement is perpendicular to the direction of the force, work done is zero.

Unit of work is joule (J). One joule of work is said to be done when a force of 1 Newton acting on a body displacing it by a distance of 1 m.
Larger units of work are

i) kilo joules      (1000 joule)         

 ii) mega joule  (10 lakh  joule)

ENERGY -   The energy of the body is defined as its capacity to do work
Unit of energy - Energy is measured in terms of work. Unit of energy is also joule. One joule of energy is required to do one joule of work.

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Answer 2

ENERGY - Energy is any source of power that makes something work.For example we can use the muscles in our arms to lift things. When we cook food on the stove,energy such as heat,light and sound. Types of energy - The sun's energy reaches us in the form of heat and light. The source of light from the sun, a star and a light bulb is known as direct light. When direct light from one object is bounced off another object, it is called reflected light. Moonlight is an example of reflected light. The direct light from the sun reflects off the moon produce moonlight.


WORK - When an object is moved from its position then work is said to be done. A machine is a device that makes work easier for us. It overcomes a force at one place by enabling a force to be applied somewhere else.


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