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Year 8 science exam
Physics component of the exam
| Question | Answer |
|---|---|
| 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
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