Conservation of Energy - Introduction (continued)
Example: If you push a block along a surface, the work that you do is W = F d. So where is the energy? The block is still on the surface, so its potential energy has not changed. The block is at rest as soon as you stop pushing it, so it has no kinetic energy. The bottom of the block heated up. In the process of pushing the block, you converted some of your energy to heat.