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RECAP THE CONCEPTS
Energy is the ability to do work or cause a change. There are different forms of energy.
Energy can be converted from one form to another but it cannot be created nor destroyed.
Kinetic energy is the energy that moving objects have.
The greater the mass or the speed of an object, the greater the kinetic energy it possesses.
Kinetic energy in a moving object will usually be converted to heat energy due to friction.
Some kinetic energy could also be converted into sound energy.
Gravitational Potential Energy
Any object that is above the ground possesses gravitational potential energy.
The greater the height or mass of the object, the more gravitational potential energy it has.
The potential energy of an object can be converted into kinetic energy when it is dropped or allowed to move down a slope.
Elastic Potential Energy
Springs or rubber bands can be stretched, compressed or twisted to store elastic potential energy.
Chemical Potential Energy
There is chemical potential energy stored in food.
Plants are able to convert light energy into chemical potential energy through the process of photosynthesis.
The chemical potential energy stored in food can be released through the process of respiration.
This energy is used to carry out life processes, such as movement, growth, digestion and breathing.