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→What does work done mean?
[[Image:Energy%20for%20KOER_html_m7d349003.png]]Notice
[[Image:Energy%20for%20KOER_html_m7d349003.png]]<br>Notice
that the work done is the same in all the three cases above though
that the work done is the same in all the three cases above though
the force applied is different. Greater the angle of inclination,
the force applied is different. Greater the angle of inclination,
greater is the force needed.
greater is the force needed.
Thus W = F x d if the distance travelled d is in
Thus W = F x d if the distance travelled d is in
the same direction as the force. If the direction in which the object
the same direction as the force. If the direction in which the object
[[Image:Energy%20for%20KOER_html_6f7bb14c.gif]]If
[[Image:Energy%20for%20KOER_html_6f7bb14c.gif]]<br>If
the force is acting perpendicular to the direction of the work done,
the force is acting perpendicular to the direction of the work done,
there is no work done. If you are carrying a heavy bag in your hand
there is no work done. If you are carrying a heavy bag in your hand
for the bag.
for the bag.
Work done, is defined as a particular form of
Work done, is defined as a particular form of
product of two vectors – force and displacement. Such a product is
product of two vectors – force and displacement. Such a product is
the context of work done, this is easy to understand. You don’t do
the context of work done, this is easy to understand. You don’t do
work in a particular direction – you just do work.
work in a particular direction – you just do work.
The unit of work done is joules. 1 J of work is
The unit of work done is joules. 1 J of work is
The rate of doing work is defined as the power. Power is defined as
The rate of doing work is defined as the power. Power is defined as
(work done)/ time taken.
(work done)/ time taken.
Power = work done/ time = force x displacement/
Power = work done/ time = force x displacement/
time = force x velocity
time = force x velocity
Its unit is Watt.
Its unit is Watt.
=== Energy, types of energy-Kinetic and potential ===
=== Energy, types of energy-Kinetic and potential ===