Main Question or Discussion Point
Work = force x displacement, so if there is zero displacement, the work is zero, right? But if I get up and walk across the room and walk back again to my starting place, the net displacement is zero, however I am told that there is still work performed. The explanation given for this is that work is a scalar quantity even though displacement is a vector. I'm not sure why this means that the net displacement needs to be broken into its component parts (effectively treating it as the scalar quantity of distance) in order to calculate the work performed...?