Work with Examples


Suppose that, a force is applied an object and object moves in the direction of applied force then we said work has done. Let me explain in other words. There must be a force applied to an object and object must move in the direction of the applied force. If the motion is not in the direction of force or force is applied to an object but there is no motion then we cannot talk about work. Now we formulize what we said above.


work examples


If the force and distance are in opposite directions then angle between them becomes 180 degree and cos180 is equal to -1.


The last case shows the third situation in which force is applied perpendicularly to the distance. Cos90 degree is zero thus, work has done is also zero. W=F.d.cos90º=0

Now let’s talk about the unit of work. From our formula we found it kg.m²/s² however, instead of this long unit we use joule. In other words;

1 joule=1N.1m


Example 25 N force is applied to a box and box moves 10m. Find the work done by the force. (Sin37º=0, 6 and cos37 º=0, 8)

work example1













Since the box moves in X direction, we should find the X and Y components of the applied force. Y component of the force does not responsible for the work. Motion of the box is in X direction. So, we use the X component of the applied force. Since the angle between X component of force and distance is zero cos0º becomes 1. I did not mention it in the solution. If it was a different value than 1 I must write it also.


Example Look at the given picture below. There is an apple having a force applied perpendicularly on it. However, it moves 5m in X work example2direction. Calculate the work done by the force.









work example3 Box is touching to the wall and force cannot move it. Because there is no distance we cannot talk about the work. As you can see our formula;

Work=Force. Distance




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