Energy is a word which tends to be used a lot in everyday life. Though it is often used quite loosely, it does have a very specific physical meaning.
Energy is … See more

Suppose we're feeling guilty about eating a chocolate bar; we want to find how much exercise we need to do to offset those extra 280 Calories. Let's consider a simple form of exercise… See more

There is one thing we need to watch out for when doing these problems. The previous equation, W=F⋅Δx‍ , doesn't take into account situations where the force we are applying is … See more

In the previous example, we were doing work on a box which we were pushing around a floor. In doing so, we were working against a frictional force.
Another co… See more

One frequent source of confusion people have with the concept of work comes about when thinking about holding a heavy weight stationary above our heads, against the force of gra… See more