Law of Conservation of Energy

The energy of our car starts with the sun. In order for trees to grow they go through the process of photosynthesis which is fueled by the sun. When the trees grow and produce apples from the photosynthesis, the apples are now a product of the sun. Us humans eat apples to get energy to go to the gym. We use our muscles from the gym to build a mousetrap car. So our car is a product from the energy of the sun. We then use our energy pull back the snapper the thermal energy is converted to potential energy which obviously started with the sun. When we release the lever the potential energy turns into kinetic energy which turns the back axle, which turns the back wheels. The back wheels use their energy to move the front wheels. When the car comes to a stop, because of friction, there is no more kinetic or potential energy, but their is thermal energy. The Law of Conservation of Energy says that energy could not be created nor destroyed, so our energy that we got from our food, which was created by the sun, created a car that always has energy.