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What is work done?
Force x distance moved in direction of force
Unit for work done
Nm or J
What is energy?
The capacity of an object to do work
Kinetic energy
Energy due to motion of an object with mass
Gravitational potential energy
Energy of an object due to its position in a gravitational field
Chemical energy
Energy contained within the chemical bond between atoms
How can chemical energy be released?
When atoms are rearranged
Elastic potential energy
Energy stored in an object as a result of reversible change in its shape
Electrical potential energy
Energy due to electrical charges due to their position in an electric field
Nuclear energy
energy within the nuclei of atoms - it can be released when the particles within the nucleus are rearranged
Electromagnetic energy
Energy associated with all electromagnetic waves, stored within the oscillating electric and magnetic fields
sound energy
Energy of mechanical waves due to movements of atoms
Internal / heat energy
Sum of the random potential and kinetic energies
What is the principle of conservation of energy?
Total energy in a closed system remains constant: energy cannot be created or destroyed, only transferred
