Practical Application Just like gas in a car, eating food gives us fuel in the form of calories. We can burn the calories we have eaten to operate a jack that can lift up a car. Real World Examples Energy transfer can be observed in hand mixing cake batter, beating an egg, hand cranking a radio and weight lifting. Challenge Yourself Using three marbles and a ruler with a groove, place one marble on the end of the ruler. Place two marbles in the middle, making sure they touch. Flick the first marble and watch what happens to the other two. The human body creates energy. When we move, kinetic energy is produced which we can then convert into work. Did You Know ? AT HOME EXPERIMENT Exhibit Key Concept Energy Transfer