24578068
Description
Flashcards by Maddy Christopher, updated more than 1 year ago
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Created by Maddy Christopher
over 5 years ago
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| Question | Answer |
| System | An object or a group of objects. |
| Dissipated | Spreading out and transfer of energy stores into less useful forms, often referred to as wasted energy. |
| Lubricant | Anything which reduces the friction between two surfaces. |
| Efficiency | Fraction of the energy supplied to a device which is transferred in a useful form. |
| Thermal conductivity | A measure of how well a material conducts energy when it's heated. |
| Specific heat capacity | Amount of heat energy needed to raise the temperature of 1kg of a substance by 1°C. |
| Conservation of energy | Energy cannot be created or destroyed, just transferred from one form to another or stored. |
| Global warming | When carbon dioxide is given off through the burning of fossil fuels, the greenhouse effect increases leading to an increased global temperature. |
| Gravitational field strength (g) | How many newtons of force are exerted on each kg of mass, it is measured in N/kg. In a question the value of g will be given. |
| Joules (J) | The unit of energy |
| Mass | The amount of matter in an object, it stays the same wherever you are (measure in kilograms). |
| Non-renewable energy store | An energy source that will eventually run out e.g. fossil fuels (coal,oil and gas) and nuclear fuel. |
| Renewable energy resource | An energy resource that will not run out (is being or can be replenished as it is used) e.g. bio-fuel, wind, solar power etc. |
| Power | The rate of which energy is transferred (how many joules per second are transferred), the power of 100W tells you 100J of energy transferred are transferred every second. |
| Spring constant | A measure of how easy it would be to stretch or compress a material; the higher the spring constant, the stiffer the spring. It is measured in N/m. |
| Sulphur dioxide | Gas given off when coal and oil are burned, this leads to the formation of acid rain. |
| Watts (W) | The unit of power. |
| Weight | The force acting on an object due to gravity, so it is different depending on the force of gravity. It is measured in newtons (N). |
| Work done | This is the same as energy transferred, it is measured in joules (J). |
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