# Physics Unit 1

A mind map to help revision, covering basic point but not going into excruicating detail.

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• Created by: Anisha
• Created on: 31-12-12 15:45
• Physics Unit 1
• Types of Energy
• Kinetic
• Thermal
• Gravitational Potential
• Light
• Sound
• Elastic Potential
• Nuclear
• Chemical
• Electrical
• Effieciency
• Efficiency = Useful Energy Out / Total Energy In
• To get a percentage then you have to multiply the answer of the efficiency by 100
• Efficiency =  Useful Power Out / Total Power In
• To get a percentage then you have to multiply the answer of the efficiency by 100
• An object that is hotter than its surrounding emits more radiation than it absorbs, (as it cools down).
• Convection
• Convection occurs when the more energetic particles MOVE from the HOTTER REGION towards the COOLER REGION - and take their heat  energy along with them.
• Convection Currents  are all about CHANGES in DENSITY
• Conduction
• Conduction is the transfer of heat  between substances that are in direct contact
• The better the conductor the more the heat would rapidly transfer.
• Solar System
• Redshift is evidence that the universe is expanding.
• CMBR = Cosmic Microwave Background Radiation
• Waves
• Longitudinal Waves
• In LONGITUDINAL waves the oscillations (vibrations)  are PARALLEL to the DIRECTION  OF ENERGY
• Transverse Waves
• Electromagnetic waves are transverse waves, since the electric and magnetic fields oscillate at a right angle to the direction of motion.
• Energy
• Energy  CANNOT be created or destroyed
• Energy can be transformed . i.e. Television (Chemical) : Electrical, Thermal,  Light and Sound Energy
• Dissipated (a word they like to use, to confuse): Energy is spread out and lost.
• Energy is only useful when converted from one form to another.
• Physics Unit 1
• Types of Energy
• Kinetic
• Thermal
• Gravitational Potential
• Light
• Sound
• Elastic Potential
• Nuclear
• Chemical
• Electrical
• Effieciency
• Efficiency = Useful Energy Out / Total Energy In
• Efficiency =  Useful Power Out / Total Power In
• An object that is hotter than its surrounding emits more radiation than it absorbs, (as it cools down).
• Convection
• Convection occurs when the more energetic particles MOVE from the HOTTER REGION towards the COOLER REGION - and take their heat  energy along with them.
• Convection Currents  are all about CHANGES in DENSITY
• Conduction
• Conduction is the transfer of heat  between substances that are in direct contact
• The better the conductor the more the heat would rapidly transfer.
• Solar System
• Redshift is evidence that the universe is expanding.
• CMBR = Cosmic Microwave Background Radiation
• Waves
• Longitudinal Waves
• In LONGITUDINAL waves the oscillations (vibrations)  are PARALLEL to the DIRECTION  OF ENERGY
• Transverse Waves
• Electromagnetic waves are transverse waves, since the electric and magnetic fields oscillate at a right angle to the direction of motion.