Forms of Energy Flashcards
Energy
Energy is the capacity to do work
Work equation
Work (J) = force x distance (moved in direction of force)
5 Forms of energy
1) Electrical
2) Chemical
3) Potential
4) Kinetic
5) Mechanical
Electrical energy
Results from the movement of charged particles (ions)
e.g. transport of a nerve impulse along a motor neurone
Chemical energy
Energy stored in chemical bonds of molecules. These bonds are broken during chemical reactions, and new ones are formed, releasing chemical energy
e.g. acetylcholine crossing synaptic cleft
Potential energy
Energy that is stored - it has has the capacity to do work but is not presently doing so - converted into kinetic energy
e.g. archery bow in draw back position, ‘set’ position on starting blocks
Kinetic energy
Energy associated with the movement/motion of an object
e.g. running, throwing/kicking a ball
Mechanical energy
Energy produced by forces to provide work and move an object
(sum of potential and kinetic energy)
e.g. moving a barbell above head, cycling
Exothermic reaction
Gives out energy
Endothermic reaction
Takes in energy
