Download What is Energy?

What is Energy?
What is Energy?
 Energy is the ability of an object to produce a
change in itself or the world around it.
 Whenever work is done, energy is transformed or is
transferred from one system to another.
Energy Transformations
Gravitational Potential Energy
 Potential energy (PE) is sometimes called energy of
position because it results from the relative positions of
objects in a system.
𝑷𝑬=𝒎𝒈𝒉
Kinetic Energy
 The energy resulting from the motion of an object is
called kinetic energy.
𝟏
𝑲𝑬 = 𝒎𝒗𝟐
𝟐
Types of Energy
Other Forms of Energy
 The sum of the kinetic and potential energy in a
system is called mechanical energy.
𝒎𝒆𝒄𝒉𝒂𝒏𝒊𝒄𝒂𝒍 𝒆𝒏𝒆𝒓𝒈𝒚 = 𝑲𝑬 + 𝑷𝑬
Energy that lies at the level of the atom is sometimes
called non-mechanical energy.
Other Forms of Energy
 Plants use photosynthesis to turn the energy of
sunlight into chemical energy.
 The sun’s energy comes from nuclear fusion.
Other Forms of Energy
 Energy can be stored in electrical fields, which have
electrical potential energy.
Other Forms of Energy
 Light energy travels from the sun to the Earth across
empty space in the form of electromagnetic waves.
 Electromagnetic waves are made up of electric and
magnetic waves.