In this photo, students are working hard in a library. But according to physics, are they really doing “work”? The answer is no. The reason is the formula for work is the force multiplied by the distance multiplied by cosine theta. The students don’t have distance since they do not move. Nor do they have force since force is found by mass times the acceleration, and they don’t have acceleration.
Another way to find work would be to find the delta energy. Kinetic energy or potential energy both require factors that the students in the photo do not have. Potential needs height and kinetic needs velocity. Unfortunately, that means the students are not actually doing work.
An important lesson for any student: Say you studied hard instead of worked hard. That way, no teacher can prove you wrong.
Physics by Mike 