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7 Cards in this Set
- Front
- Back
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What is the law of conservation of energy? |
The law of conservation of energy states that energy cannot be created or destroyed. This means that the total energy transferred by a system (eg a lightbulb) must be the same as the input. |
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Energy diargams |
Back (Definition) |
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Different ways in which energy can be transferred by heating |
CONDUCTION- vibrations are passed on between particles in a solid. CONVECTION- part of a fluid that is warmer than the rest rises and sets up a convection current which rotates in a circle. RADIATION- is the only way in which energy can be transferred through a vacuum. Infrared radiation can also pass through gases and some solid materials. Infrared radiation is emitted easily by dull, dark surfaces, and is absorbed and emitted portly by light, shiny sirfaces |
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What decreases the rate at which energy transferred through a material by heating |
Increasing the thickness, decreasing thermal conductivity and decreasing temperature difference. |
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What decreases the rate at which energy transferred through a material by heating |
Increasing the thickness, decreasing thermal conductivity and decreasing temperature difference. |
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What is GPE and how is calculated? |
Is energy that is stirred because of an objects position in a gravitational field. Any object above the earths surface contains a store of gravitational potential energy. Change in GPE (j) = mass(kg) x gravitational field strength (m/kg) x change in vertical height (m) |
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What is kinetic energy and how do you find it? |
Energy stored in moving objects. Kinetic energy (j) = 0.5 x mass (kg) x speed2 (m/s)2 |
