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Year 8 science exam

Physics component of the exam

QuestionAnswer
Energy The ability to do work
Law of conservation of energy Energy can not be created or destroyed
Kinetic energy Movement
Potential energy Stored energy (not currently being used)
Thermal energy Energy made by heat
Elastic energy Energy stored in elastic objects
Gravitation energy Energy created by the gravitational pull of the Earth
Chemical energy Energy stored in chemical, that is released when they react
Electrical energy Energy supplied to homes via power lines
Light energy Energy that is released in the form of light waves
Sound energy Energy carried in the air through sound waves
Energy Transformation When energy moves from one form to another i.e. electrical energy into light energy
Conduction 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.
Convection 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.
Radiation Thermal transfer of energy which DOES NOT involve particles
Insulation An object that prevents thermal transfer of conduction, the best insulators have make use or air as it is a poor conductor of heat.
Reflected heat Shinning or light coloured surfaced reflect the heat back, the temperature of these objects doesn't change quickly
Transmitted heat Clear objects allow heat to transmit through them
Absorbed/Radiant heat Dark objects absorb the heat energy, their temperature will change quickly
Luminous An object that produces it own light source
Incandescent An object that emmits light because it's hot
Bio luminescent Living things that emmit light without being hot
Non-luminous Object that we can see that do not emit light. We see them because the light bounces off them
Electromagnetic Spectrum A range of wavelengths that emmit different frequencies
Visible spectrum of light The same range of the electromagnetic spectrum that we can see
Concave mirror This is the shape of a cave. These make object appear smaller as the focal point is before the mirror
Convex mirror This is the opposite shape of a cave. These make object appear larger as the focal point is after the mirror
Reflection When light is pushed back of a flat mirror is appear to look the same, only in reverse i.e. left becomes right
Refraction When light is transmitted from one object to another is can slow down or speed up, this will cause the light to bend
Convex lens This is the 'fat' lens, when light goes though it, it gets pushed inwards
Concave lens This is the 'skinny' lens, when light goes through it, it gets pushed outwards
Sound waves Caused by a movement of particles in the air, which compressing and rarefacting
Compression When the particles are close together in a sound wave
Rarefaction When the particles are far apart in a sound wave
Wavelength In a sound wave it's the distance between two compressions. In a light wave it is the distance between the two peaks
Amplitude The amount the particle moves. In a sound wave they left and right, in a light wave they move up and down.
Frequency The number of compressions (or waves) per second.
Created by: NWSP12