O_TEXTBLOCK_TEXT When the droid exerts <HL Topic=Force.tpc>FORCE</HL> on the spring and the spring compresses, the droid is doing <HL Topic=Work.tpc>WORK</HL> on the spring. The work is stored in the spring as <HL Topic=Potential.tpc>POTENTIAL ENERGY</HL>. As soon as the droid lets go, the spring's potential energy is released and changes to <HL Topic=Kinetic.tpc>KINETIC ENERGY</HL> pushing the droid backward. As the droid comes to a stop, the <HL Topic=Energy.tpc>ENERGY</HL> has not been destroyed, but changed to <HL Topic=Heat.tpc>HEAT</HL>.
E_QUEST1 How is energy changed from one form to another when you turn on a lamp?
E_QUEST2 How is it changed when you swing on a swing?
E_QUEST3 How is it changed when you play with a yo-yo?
D_TEXTBLOCK_TEXT The law of conservation of energy states that <HL Topic=Energy.tpc>ENERGY</HL> cannot be created or destroyed, it can only be converted or changed from one form into another.