Law of conservation of energy

Due to the conservation of momentum and energy in a Newton's Cradle, pulling back two balls will result in two balls swinging off the other end.

When a book falls, its potential energy converts to kinetic energy, and upon impact, it dissipates as sound energy and thermal energy.

Lifting an object against gravity increases its gravitational potential energy. The work done on the object is stored as potential energy.

Elastic potential energy is proportional to the square of the displacement (stretch). Therefore, stretching a rubber band further increases the stored potential energy.

When you stretch a rubber band, you are doing work on it, which converts the kinetic energy of your muscles into elastic potential energy stored in the band.

As water falls, its gravitational potential energy is converted into kinetic energy, which is then used to spin turbines in hydroelectric power plants.

Water held behind a dam is at a higher elevation than the river below, giving it gravitational potential energy due to its position.

In a roller coaster, mechanical energy is lost to the environment due to friction and air resistance. This energy is dissipated as heat, which is why the coaster does not return to its original height.

The law of conservation of energy states that energy cannot be created or destroyed, only transformed. Therefore, the total amount of energy in a closed system remains constant.

The law of conservation of energy is a fundamental principle stating that energy is neither created nor destroyed in an isolated system, but merely changes from one form to another.