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Year 8 science exam
Physics component of the exam
|The ability to do work
|Law of conservation of energy
|Energy can not be created or destroyed
|Stored energy (not currently being used)
|Energy made by heat
|Energy stored in elastic objects
|Energy created by the gravitational pull of the Earth
|Energy stored in chemical, that is released when they react
|Energy supplied to homes via power lines
|Energy that is released in the form of light waves
|Energy carried in the air through sound waves
|When energy moves from one form to another i.e. electrical energy into light energy
|Thermal transfer of energy which occurs as a result of the particles in a solid object vibrating and transferring the heat to the particles next to them.
|Thermal transfer of energy which occurs in liquids and gases. The particles in an object warm up, rise to the top, drop of their heat and circulate back down.
|Thermal transfer of energy which DOES NOT involve particles
|An object that prevents thermal transfer of conduction, the best insulators have make use or air as it is a poor conductor of heat.
|Shinning or light coloured surfaced reflect the heat back, the temperature of these objects doesn't change quickly
|Clear objects allow heat to transmit through them
|Dark objects absorb the heat energy, their temperature will change quickly
|An object that produces it own light source
|An object that emmits light because it's hot
|Living things that emmit light without being hot
|Object that we can see that do not emit light. We see them because the light bounces off them
|A range of wavelengths that emmit different frequencies
|Visible spectrum of light
|The same range of the electromagnetic spectrum that we can see
|This is the shape of a cave. These make object appear smaller as the focal point is before the mirror
|This is the opposite shape of a cave. These make object appear larger as the focal point is after the mirror
|When light is pushed back of a flat mirror is appear to look the same, only in reverse i.e. left becomes right
|When light is transmitted from one object to another is can slow down or speed up, this will cause the light to bend
|This is the 'fat' lens, when light goes though it, it gets pushed inwards
|This is the 'skinny' lens, when light goes through it, it gets pushed outwards
|Caused by a movement of particles in the air, which compressing and rarefacting
|When the particles are close together in a sound wave
|When the particles are far apart in a sound wave
|In a sound wave it's the distance between two compressions. In a light wave it is the distance between the two peaks
|The amount the particle moves. In a sound wave they left and right, in a light wave they move up and down.
|The number of compressions (or waves) per second.