It possesses potential energy. The potential energy of the block is due to gravity. Other examples of potential energy are a wound spring, a taut bowstring, a stretched rubber band and an inflated balloon. Kinetic energy Let the block fall. The block has kinetic energy, the energy of movement as it falls, and has the ability to do work.
Potential energy is converted into kinetic energy.
The kinetic energy in this example is also due to the force of gravity. The most efficient means of transportation in terms of energy utilization is the bicycle. To cover one kilometre, a cyclist expends 20 to 100 times less energy than a car driver. In every situation, the transformation of energy is inefficient because we are unable to harness all the energy available. It is not possible, for example, to convert the chemical energy of coal directly into electrical energy.