examples of work energy theorem
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Answer:
Example
To further understand the work-energy theorem, it can help to look at an example. Imagine a skier moving at a constant velocity on a flat, frictionless surface. If someone comes up behind him and pushes them for a distance - essentially doing work on the skier - then they will speed up as a result of their kinetic energy increasing. This type of working is known as positive work since the force was applied in the motion of the skier. If however the person pushed opposite to the skiers motion, the skier would slow down as a result of their kinetic energy decreasing. This type of work is known as negative work. The visual above shows an example of such a situation, just with the skier replaced by a block.
Since in reality there are no frictionless surfaces, the friction force opposing the skiers motion would have to be accounted for and this is why the equation contains the term Wnet, as it is a sum of all the forces acting over a distance.