Physics P1
- Created by: phanfictionanddilhowlter
- Created on: 09-05-16 17:32
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- P1.1 - Energy
- P1.1.1 - Infrared Radiation
- Infrared Radiation is energy transfer by electro magnetic waves
- All objects emit infrared radiation.
- The hotter an object is the more infrared radiation it emits at a given time.
- P1.1.2 - Surfaces and Radiation.
- Dark Matt Surfaces Emit more infrared than light shiny surfaces.
- Dark, matt objects absorb more infrared than light shiny surfaces.
- Light, shiny surfaces emit more infrared than dark matt surfaces.
- P1.1.3 - States of Matter
- Flow, shape and volume are the processes used to describe states of matter.
- The particles in a solid are held close together in fixed positions.
- The particles in a liquid move about slightly more at random but still maintain contact.
- The particles in a gas move around much more randomly, and are more spaced out
- P1.1.4 - Conduction
- Metals are the best energy conductors
- Materials such as wool and fibreglass are the best insulators.
- Conduction in Metals is mainly due to free electrons transferring the energy between them.
- Non-Metals are poor conductors because they do not contain free electrons
- P1.1.5 - Convection
- Convection is the circulation of a fluid caused by heating it.
- Convection takes place only in liquids and gases.
- Heating a liquid or a gas makes it less dense so it rises and cause circulation.
- P1.1.6 - Evaporation and Condensation
- Evaporation is when a liquid turns into a gas.
- Condensation is where a gas turns into a liquid.
- Cooling by evaporation of a liquid is due to the faster moving molecules escaping from the liquid.
- Evaporation can be increased by increasing the surface area of the liquid, by increasing the liquids temperature, or by creating a draught of air across the liquid's surface.
- Condensation on a surface can be increased by increasing the area of the surface or by reducing the temperature of the surface.
- P1.1.7 - Energy Transfer by Design.
- The rate of energy transferred to or from an object depends on
- The size, shape and type of material of the object.
- The materials the object is in contact with.
- The temperature difference between the object and its surroundings.
- The rate of energy transferred to or from an object depends on
- P1.1.8 - Specific Heat Capacity.
- The greater the mass of an object, the more slowly its temperature increases when it is heated.
- The rate of temperature change of a substance when it is heated depends on:
- The energy supplied to it
- It's mass
- Its specific heat capacity.
- Storage heaters use off-peak electricity to store energy in special bricks.
- P1.1.9 - Heating and Insulating Buildings.
- Energy transfer from our homes can be reduced by fitting.
- Loft Insulaltion
- Cavity Wall Insulation
- Double Glazing
- Draught Proofing
- Aluminium foil behind radiators.
- U-Values tell us how much energy passes each second through different materials
- Solar heating panels do not use fuel to heat water but they are expensive to buy and install.
- Energy transfer from our homes can be reduced by fitting.
- P1.1.1 - Infrared Radiation
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