In the previous chapters, we have been considering the phenomena of conservation of energy, which is the idea that the total energy of a closed system does not change in time. If we push the block hor...In the previous chapters, we have been considering the phenomena of conservation of energy, which is the idea that the total energy of a closed system does not change in time. If we push the block horizontally, a distance 10 m, we get W=(10N)(10M)cos(0)=100 J. (Notice the energy units!) The angle was zero here because we are pushing in the same direction as the motion of the block.
