Energy is known commonly as the ability to do work or move a matter. The type of energy that is stored is called potential energy.
- So a bent ruler often has higher energy than a flat ruler. If the ruler moves, it is having an some form of kinetic energy and thus a flying bent ruler is having higher amount of energy than the one that is not bent.
if the ruler is released at the bent end, the object or pebbles on it will fly. If you hold two positive charges near each other, they have potential energy because they will move if you release them.
If the object released is fired straight up into the air, it begins with a high kinetic energy. As it rises, it slows down due to the force of gravity pulling it toward the earth.
Due to the release, the object place on the ruler rises, its gravitational potential energy is therefore increasing and its kinetic energy is decreasing.
When the object reaches the top of its arc, it kinetic energy is zero and its potential energy is maximum.
Then gravity still to pull the object down the earth and the object will fall toward the earth and just as it falls down, its speed increases and its height decreases.
So, its kinetic energy will thus increases as it falls and its potential energy decreases.
When the object has returns to its original height, its kinetic energy will be the same as when it started upward.
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