Potential Energy by Kateri

Potential energy is the stored energy of an object. Three types of potential energy are elastic potential energy, gravitational potential energy, and chemical potential energy.

Elastic potential energy is stored in objects that can stretch, and sometimes compress. Balloons, springs, diving boards, and rubber bands are just a few examples of things that can hold elastic potential energy. Stretching a rubber band requires energy, and that energy is changed into potential energy. When the rubber band is let go, the energy is released.

The next type of potential energy is gravitational potential energy. The higher up an object is place, the more gravitational potential energy an object has. This energy is built up because of gravity. When an object is dropped from a high space, the potential energy is directly changed into kinetic energy. If two objects of different masses are held at the same height, and then dropped, the object with the heavier mass will fall faster. Air resistance can have an effect on how fast an object falls. For example, a crumpled piece of paper will fall faster than an unfolded piece of paper because it is more aerodynamic.

Potential energy can also be found in the chemical bonds of a substance. This type of energy is called chemical potential energy. Gasoline is an example of where you can find chemical potential energy. Gasoline in it’s liquid form holds energy, and this energy can be released when gasoline is lit on fire. When gasoline is burnt, part of the energy turns into work, but heat is also produced which is why car engines  become so hot. Batteries also hold chemical potential energy, and batteries sure are useful. Food is another example of chemical potential energy, and the energy in this food is very important. The stored energy is released when food is digested. Thanks to potential energy, you have enough energy to do basically anything.

It is amazing that energy can be stored in something as simple as a rubber band. Potential energy stored in foods are especially important, perhaps the most important way energy is stored.

Could potential energy in food be used to power cars?