Physics Unit One Key Points

This is from the AQA science revision guide. Sorry about some of the stuff I ran out of characters I could use so there might be some mistakes or grammar issues :) These are just the key points by the way, and a full stop is the end of one point, hope these help!

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Infrared Radiation- Key facts
Infrared radiation is energy transfer by electromagnetic waves. All objects emit infrared radiation. The hotter an object is the more infrared radiation it emits in a given time.
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Surfaces and Radiation- Key facts
Dark, matt surfaces emit infrared radiation more quickly than light shiny surfaces. Dark matt surfaces absorb infrared radiation more quickly than light, shiny surfaces. Light, shiny surfaces reflect more infrared radiation than dark, matt surfaces.
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States of matter- Key Facts
The particles in a solid ae held next to each other vibrating in their fixed positions. The particles in a liquid move about at random and are in contact with each other. The particles in a gas move about randomly and are far apart.
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Conduction- Key facts
Metals are the best conductors. Materials such as wool and fibreglass are good insulators. Conduction in a metal is mainly due to free electrons transferring energy inside the metal. Nonmetals are poor conductors coz they don't contain free electrons
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Convection- Key facts
Convection is the circulation of a fluid (liquid or gas). Heating a liquid or a gas makes it less dense so it rises and causes circulation.
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Evaporation and condensation- key facts
Evaporation is when a liquid turns into a gas. Condensation is when a gas turns into a liquid.
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Energy Transfer by Design- key facts
The rate of energy transfer to or from an object depends on; the shape, size, type of material of the object, the materials the object is in contact with, the temperture difference between the object and it's surroundings.,
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Specific Heat capacity- key facts
The grater the mass of an object, the more slowly its temperature increases when it's heated. The rate of temperature change in a substance when heated depends on the energy transferred to it, its mass and its specifc heat capacity.
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Heating and insulating buildings- Key Facts
The rate of energy transfer to or from our homes can be reduced. U-Values tell us how much energy per second passes through different materials. The lower the U-Value the better the material i as an insulator.
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Heating and insulating buildings, continued...
Solar heating panels do not use fuel to heat water but they are expensive to buy and install.
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Other cards in this set

Card 2

Front

Dark, matt surfaces emit infrared radiation more quickly than light shiny surfaces. Dark matt surfaces absorb infrared radiation more quickly than light, shiny surfaces. Light, shiny surfaces reflect more infrared radiation than dark, matt surfaces.

Back

Surfaces and Radiation- Key facts

Card 3

Front

The particles in a solid ae held next to each other vibrating in their fixed positions. The particles in a liquid move about at random and are in contact with each other. The particles in a gas move about randomly and are far apart.

Back

Preview of the back of card 3

Card 4

Front

Metals are the best conductors. Materials such as wool and fibreglass are good insulators. Conduction in a metal is mainly due to free electrons transferring energy inside the metal. Nonmetals are poor conductors coz they don't contain free electrons

Back

Preview of the back of card 4

Card 5

Front

Convection is the circulation of a fluid (liquid or gas). Heating a liquid or a gas makes it less dense so it rises and causes circulation.

Back

Preview of the back of card 5
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