Physics P1

Question	Answer
Physics Energy transfer by heating	Every object emits inferred radiation.
Physics Energy transfer by heating	The hotter an object is the more inferred radiation it emits in a given time.
Physics Energy transfer by heating	Inferred radiation is energy transferred by electromagnetic waves.
Physics Energy transfer by heating	Dark, Matt surfaces emit more inferred radiation than light, shiny surfaces.
Physics Energy transfer by heating	Dark, Matt surfaces absorb more inferred radiation than light, shiny surfaces.
Physics Energy transfer by heating	Light, shiny surfaces reflect more inferred radiation, than matt black radiation.
Physics Energy transfer by heating	Flow, shape, volume and density are the properties used to describe each state of matter.
Physics Energy transfer by heating	The particles in solids are held next to each other in fixed positions
Physics Energy transfer by heating	The particles in a liquid move around at random, and are in contact with each other.
Physics Energy transfer by heating	The particles in a gas more around randomly, and are much further apart than particles in a solid and liquid.
Physics Energy transfer by heating	Metals are the best conductors of energy.
Physics Energy transfer by heating	Materials such as fiberglass and wool are the best insulators.
Physics Energy transfer by heating	Conduction of energy in a metal is due mainly to free electrons transferring energy inside the metal.
Physics Energy transfer by heating	Non-metals are poor conductors because they do not contain free electrons.
Physics Energy transfer by heating	Convection is the circulation of a fluid (Liquid and Gas) caused by heating it.
Physics Energy transfer by heating	Convection takes place only in lipids and gases.
Physics Energy transfer by heating	Heating a liquid or gas makes it less dense so it rises and causes circulation.
Physics Energy transfer by heating	Evaporation is when a liquid turns into a gas.
Physics Energy transfer by heating	Condensation is when a gas turns into a liquid.
Physics Energy transfer by heating	Cooling by evaporation of a liquid is due to the faster moving molecules escaping from the liquid.
Physics Energy transfer by heating	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.
Physics Energy transfer by heating	Condensation on a surface can be increased by increasing the area of the surface, or reducing the temperature of the surface.
Physics Energy transfer by heating	The rate of energy transferred to or from an object depends on: - The shape, size and type of material of the object. - The materials the object is in contact with. - The temperature difference between the object and its surroundings.
Physics Energy transfer by heating	The greater the mass of an object, the more slowly its temperature increases when heated.
Physics Energy transfer by heating	The rate of temperature change of a substance when it is heated depends on: - The energy supplied to it - Its mass - Its specific heat capacity.
Physics Energy transfer by heating	Storage heaters are off-peak electricity to store energy in special bricks.
Physics Energy transfer by heating	Energy transfer from our homes can be reduced by fitting: - Loft insulation. - Cavity wall insulation. Double glazing -Draught proofing -Aluminium foil behind radiators.
Physics Energy transfer by heating	U-values tell us how much energy per second passes through different materials
Physics Energy transfer by heating	Solar heating panels do not use fuel to heat water but they are expensive to buy and install.
Physics Using Energy	Energy exists in different forms.
Physics Using Energy	Energy can change from one form to another.
Physics Using Energy	When an object falls and gains speed, its gravitational potential energy decreases, and its kinetic energy increases.
Physics Using Energy	Energy cannot be created or destroyed.
Physics Using Energy	Conservation of energy applies to all energy changes.
Physics Using Energy	Useful energy is energy in the place we want it, and i the form we need it.
Physics Using Energy	Wasted energy is energy that is not useful.
Physics Using Energy	Useful energy and wasted energy both end up being transferred to the surroundings, which become warmer.
Physics Using Energy	As energy spreads out it gets more and more difficult to use for further energy transfers.
Physics Using Energy	No machine can be more than 100% efficient.
Physics Using Energy	Measures to make machines more efficient include reducing friction, air resistance, and noise due to vibrations.
Physics Using Energy	Electrical appliances can transfer electrical energy into useful energy at the flick of a switch.
Physics Electrical energy	An electrical appliance is designed for a particular purpose and should waste as little energy as possible.
Physics Electrical energy	Power is the rate of transfer of energy.
Physics Electrical energy	The kilowatt-hour is the energy supplied to a 1KW appliance in 1 hour.
Physics Electrical energy	Cost effectiveness means getting the best value for money
Physics Electrical energy	To compare the cost effectiveness of different appliances, we need to take account of costs to buy it, running costs and other costs such as environmental costs.

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	Created by Georgie Townsend about 11 years ago