# Energy

## Kinetic Energy

Kinetic energy is the energy possessed by an object due to its motion.

If a rollercoaster is stopped and at the beginning of the tracks loading people in to it's carts. This rollercoaster at the time has no kinetic energy, but as soon as the rollercoaster starts on its path through the tracks it gains kinetic energy. At the point when the rollercoaster is at the bottom of its steepest descent it has the most kinetic energy.

## Potential energy is energy that is stored when a object is at rest.

When shooting a bow and arrow. The energy is converted from the potential energy in the archer's arm to the potential energy in the bent limbs of the bow when the string is drawn back. When the string is released the potential energy in the bow limbs is transferred back through the string to become kinetic in the arrow as it takes flight.

## Conservation of Energy

In physics, the law of conservation of energy states that the total energy of an isolated system cannot change. It is said to be conserved over time. Energy can be neither created or destroyed.

When blowing up a stick of dynamite. You convert chemical energy to kinetic energy in the explosion.