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Line 130: − Work done, is defined as a particular form of+ − product of two vectors – force and displacement. Such a product is − called the scalar product and the resulting quantity is a scalar. In − the context of work done, this is easy to understand. You don’t do − work in a particular direction – you just do work. − − The unit of work done is joules. 1 J of work is − said to be done when a force of 1 N causes a displacement of 1 m. − − − When work is done, it is done over a certain time. − The rate of doing work is defined as the power. Power is defined as − (work done)/ time taken. − − Power = work done/ time = force x displacement/ − time = force x velocity − − Its unit is Watt.
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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.
[[Image:Screenshot from 2013-01-18 12:20:06.png]]
Thus W = F x d if the distance travelled d is in
Thus W = F x d if the distance travelled d is in
for the bag.
for the bag.
W
=== Energy, types of energy-Kinetic and potential ===
=== Energy, types of energy-Kinetic and potential ===