Conservation of Mechanical Energy
If you look at the roller coasters, you can find something very interesting. That’s right, there is no engine on the roller coaster. When we lift the roller coaster to the highest point, then the roller coaster moves by itself.
This is where mechanical energy conversion and conservation is applied. In other words, if you lift it to a very high point before you start, the roller coaster will have a very large potential energy. This roller coaster falls down and the potential energy is reduced. This reduced potential increases kinetic energy.
What is the fastest speed of a roller coaster? The fastest speed means the greatest kinetic energy. This also means that the potential energy is the smallest. In other words, the speed of the roller coaster will be the fastest when you are on the ground.
This is similar in viking attraction. The viking attraction has the highest end on both ends. And the fastest speed on the floor. At every point, kinetic energy and potential energy are complementary. After all, the total energy always remains the same.
However, in our world, mechanical energy conservation is hard to find. That’s because of the resistance and friction of the air. For example, consider raindrops falling from very high places as mechanical energy conservation. Raindrops can be terribly fast and may destroy buildings. Of course that does not actually happen.