physics definitions. acceleration is the rate of change in velocity of an object divided by the time...
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![Page 1: Physics definitions. 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](https://reader036.vdocuments.mx/reader036/viewer/2022070308/551bf180550346b4588b6630/html5/thumbnails/1.jpg)
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/cm3 or kg/m3.
• 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 =WorkTime
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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=DistanceTime
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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
• cm3 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 DistanceJoules