guys I need the summary of work , energy and power
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Whenever a force makes a body move, then work is said to be done. But for doing work, energy is required. When work is done by human beings, machines or animals they get energy from the food which they eat and if work is done via machines, then energy is supplied by fuels or by electricity. So, we can say that when work is done an equal amount of energy is used up. This article deals with the summary of Work, Power and Energy, its mechanism, formulas and how they are related to each other in a crux form which not only clear your concepts but also help in your preparation and in solving problems.
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Summary on Work, Power and Energy
Work is done when a force produces motion. And for doing work energy is required. This energy we get from the food which we eat and if work is done by machine, then energy is supplied by fuels or by electricity. This article deals with the summary of Work, Power and Energy, its mechanism, formulas and how they are related to each other in a crux form which not only clear your concepts but also help in your preparation and in solving problems.
SHIKHA GOYAL
Created On: Dec 13, 2016 16:31 IST
Modified On: Dec 14, 2016 12:02 IST
Whenever a force makes a body move, then work is said to be done. But for doing work, energy is required. When work is done by human beings, machines or animals they get energy from the food which they eat and if work is done via machines, then energy is supplied by fuels or by electricity. So, we can say that when work is done an equal amount of energy is used up. This article deals with the summary of Work, Power and Energy, its mechanism, formulas and how they are related to each other in a crux form which not only clear your concepts but also help in your preparation and in solving problems.
Work
Work can be done when a force produces a motion. For e.g. when a person climbs the stairs of an office or a house, work is said to be done as he is moving against the force of gravity.
(i) Magnitude of the force
(ii) Distance through which the body moves in the direction of force.
Therefore, Work is measured by the product of force and displacement of the body along the direction of force. It is a scalar quantity and its SI unit is joule.
Work = Force X Distance (S) moved in the direction of force
Or Work = F X S
- If a body gets displaced by S when a force F acts on it, then
Work W = F S Cos θ
Where θ = angle between force and displacement
Note: The condition for a force to do work is that it should produce motion in an object, i.e. if the distance moved is zero, and then the work done on an object is also zero. For example, if a man pushes a wall, but there is no displacement that is wall is stationary it does not move, then, the work done by the man on the wall is zero. But the work done on the body of the man himself is not zero. Because while pushing the wall man consumes energy, his muscles are stretched and he feels tired.
Also, we can take another example that if a man stands still at a bus stop with heavy suitcase in his hand, he may get tired soon but he does no work in this situation because suitcase held by the man do not move at all.
So, it is clear now that whenever a force is applied to an object it is not necessary that work is done. Work is done when force able to move the object.
What happens when work is done against gravity?
Whenever work is done against gravity, the amount of work done is equal to the product of weight of the body and the vertical distance through which the body is lifted.
Work done in lifting a body = Weight of body x Vertical distance
W = m x g x h
Where W = work done
m = mass of the body
g = acceleration due to gravity
h = height through which the body is lifted
Motion and Mechanics
Energy
Capacity of doing work by a body is called energy. Energy is a scalar quantity i.e. it has only magnitude but no direction and its unit is joule. The energy required to do 1 joule of work is called 1 joule energy.
1 Kilojoules (KJ) = 1000 joules (J)
The unit joule is named after a British physicist James Prescott Joule.
hope it helps
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