energy types
DESCRIPTION
Middle school scienceTRANSCRIPT
Energy
10 Types:• Gravitational Potential• Electrical• Sound• Thermal/Heat• Radiant/Light• Elastic (strain)• Chemical• Nuclear• Kinetic• Magnetic
• Law of conservation of Energy:“Energy cannot be created or destroyed.
It can only be changed from one form to another.”
There are 10 forms energy can take:You must know these.
Gravitational Potential Energy
• This is energy of height. If you do work on an object against gravity it gains G.P.E..
• Formula: G.P.E.=Weight*Height
• E.g. You lift a 300N child by 40m.• How much work is done on him?• How much G.P.E. does he gain?
Electrical Energy
• This is simply energy delivered by electrical wires, by moving charge.
Light Energy
• This is energy transferred by light. A bulb gives out light energy.
Sound Energy
• Energy of sound- produced by vibrations.
Thermal (Heat) Energy
• Energy of hot objects
Radiant Energy (includes light energy)• Energy given out as
electromagnetic waves. E.g. the Sun emits ultraviolet waves which give the Earth energy.
Elastic (potential) Energy (strain)
• Energy stored in a stretched or compressed object.
Chemical Energy
• Energy that can be released in a chemical reaction.
• This includes energy from food released in respiration.
Nuclear Energy
• Energy stored in an atomic nucleus. It can be released in power stations.
Kinetic Energy
• This is energy of movement. Faster objects have more K.E.
• Formula: K.E.=½mv²
Magnetic (potential) energy
• The energy stored due to magnets
Energy changesWhat energy changes occur when the
following things happen?• (a) a battery lights a light bulb• (b) a boy lifts up a rock• (c) an arrow is fired from a bow• (d) a firework rocket moves upwards• (e) a car is braked to a stop on a level
road• (f) a firework explodes• (g) a CD player plays a CD• (h) a plant grows in the garden
Write the energy changes
a) A monkey climbs a treeb) A person acceleratesc) A piece of paper burnsd) A catapult fires a rocke) A plant photosynthesisesf) Water coolsg) 2 magnets push each other away