30 Mar Science Tuition – Energy
At Miracle Learning Centre, our best in class faculty team will provide you with the simplest explanations for all the hard topics of Science which you have been having problems understanding.
In this science tuition lesson, we will be finding out more about energy.
What is energy?
Energy is the ability to do work. Energy is essential to life and all living organisms. The sun, directly or indirectly, is the source of all the energy available on Earth. Energy comes in different forms for example, heat (thermal), light (radiant), kinetic, potential, electrical energy etc.
People use energy for everything from walking to sending astronauts into space. There are two types of energy. They are stored (potential) energy and working (kinetic) energy. For example, the food a person eats contains chemical energy, the person’s body will then transform this energy to kinetic energy during work or play.
Kinetic energy is the energy an object has because of its motion. Kinetic energy can be transferred between objects and transformed into other kinds of energy. The formula for kinetic energy is 1/2 x m x v2 . The change in kinetic energy is equal to the net work done on an object.
One example of potential energy is the gravitational potential energy. Gravitational potential energy is the energy stored in an object as a result of its vertical position or height. The energy is stored due to the gravitational attraction of the Earth for the object. There is a direct relationship between gravitational potential energy and the mass of an object. The heavier the objects, the greater the gravitational potential energy will be. There is also a direct relationship between gravitational potential energy and the height of an object. The higher an object is elevated, the greater the gravitational potential energy. The formula for gravitational potential energy will be mass x gram x height.
Energy sources are categorized as renewable and non-renewable. Renewable is an energy source that can be easily replenished such as solar and wind energy. While non-renewable is an energy source that cannot be easily replenished such as nuclear energy. Renewable and non-renewable energy sources can be used to produce useful energy such as heat or electricity.
The law of conservation of energy states that the total energy of an isolated system remains constant. Energy can neither be created nor destroyed. It can only be transformed or transferred from one form to another.
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