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Physics definitions

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Acceleration Is the rate of change in velocity of an object divided by the time taken for the change. It is measured in ms-2

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Centre of gravity Is the point in a body where all the weight of the body appears to be concentrated

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conduction The transfer of energy through a solid without any movement of the particles

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Conservation of energy Energy cannot be created or destroyed only converted from one form into another

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convection The transfer of heat through a liquid or gas caused by the movement of its particles

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Current (I) The movement of an electric charge between two points. It is measured in Amperes

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density Density is the mass per unit volume of an object. It is measured in g/cm 3 or kg/m 3. Density = Mass Volume

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dispersion The breaking up of white light into its constituent colours

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energy Is the ability to do work JOULES

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flotation Is when a less dense object floats in a liquid more dense that the object.

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force A force is a push or a pull which causes a change in the velocity of an object. It is measured in Newtons (weight is a FORCE…..of gravity)

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friction Friction is the force between two objects which tries to stop them moving

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fulcrum The fixed point around which a lever pivots or turns

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Hookes Law The extension in a spring is proportional to the weight applied to it

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Latent heat Is the amount of heat energy that causes a change in state without causing a change in temperature

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Law of the lever When a lever is in equilibrium the sum of the clockwise moments are equal to the sum of the anti clockwise moments

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Magnetic field The space around a magnet where a magnetic force can be felt

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mass The amount of matter in an object. It is measured in Kg

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Non renewable energy This is the energy supplied by fossil fuels. They cannot be replenished in a short space of time.

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Ohms law The current is proportional to the voltage in a conductor at constant temp. V = IR or R = V I

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power The amount of work done divided by the time. It is measured in Watts Power =Work Time

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pressure The force that an object exerts over unit area. It is measured in Pascals Pressure =Force Area

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radiation Heat transfer by waves even through a vacuum eg heat radiation from the sun

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reflection The bouncing of light from a reflective surface

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refraction The bending of light as it travels from one medium to another

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Renewable energy Energy that is in continuous supply and comes from natural resources

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speed Is the distance travelled in unit time. It is measured in ms -1 Speed=Distance Time

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temperature The measure of how hot or cold an object is. It is measured in degrees Celsius

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Velocity Is speed in a given direction. It is measured in ms-1

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Volume The amount of space something takes up Units cm 3 for solids ml or litres for liquids

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Weight Is the force on an object caused by gravity. It is measured in Newtons Weight= Mass (kg) X 10

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work Work is done when a force moves an object a distance. It is measured in Joules Work= Force X Distance Joules

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