13919500
Description
Flashcards by Oliver Faragher, updated more than 1 year ago
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Created by Oliver Faragher
almost 6 years ago
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| Question | Answer |
| What is potential energy? | Stored Energy |
| What types of potential energy are there? | Gravitational Elastic |
| What is the gravitational field strength of earth? (1 d.p) | 9.8N/Kg |
| What is energy measured in? | Joules |
| What happens to fuel consumption in a vehicle as its Ek goes up? | The fuel consumption increases |
| Why is energy lost and what is it lost to? | Heat Air Resistance Sound |
| What increases work done? | Force exerted Distance traveled (increase in displacement) |
| What is power? | The rate of doing work (transferring energy) |
| What is Watts? | Measurement of power (J/s) |
| What is specific heat capacity? | The energy needed to heat 1kg of a certain material by 1 degree centigrade J / Kg / Degree Centigrade |
| Why is water used to cool things down? | It has a very high SHC meaning it can absorb a lot more thermal energy per degree of increase than other objects Other objects can transfer lots of degrees centigrade for only 1 degree centigrade increase Water = 4200J / Kg / degree |
| How do you test an objects SHC? | Freeze it down to 0 degrees centigrade Transfer it into a liquid that you know the SHC of Measure temperature decrease / increase Divide joules gained by degrees increased |
| What is the problem with this method? | It assumes no energy is lost to the surrounding area |
| What is it called when objects have cooled/heated and have reach the same temperature? | Thermal Equilibrium |
| What are the two methods of reducing heat loss in objects? | Lubrication and Thermal Insulation |
| How does insulation reduce thermal energy loss? | It blocks or reduces thermal energy conduction |
| What is the correct term for energy being lost? | Dissapation |
| How can energy dissipate in a car? | Thermal energy lost via engines and wheel Sound energy lost by noise of engine Friction by the wheels (loss of kinetic) |
| What is the law of conservation of energy? | Energy cannot be created of destroyed, only transfered |
| What are the three ways of losing thermal energy? | Conduction Convection Radiation |
| What are the possible methods of energy collection? | Fossil fuels, Biofuel, Wind, Wave, Hydroelectric, Solar and Geothermal |
| What are the two concerns when identifying possible energy sources? | Concentration (the amount needed to produce enough energy) Reliability (how easy it is to harness the energy) |
| What are renewable resources? | Resources that will not run out in the foreseeable future |
| What are non-renewable resources? | Resources that will run out because we are using them faster than they are being produced |
| What is the trend of global energy usage? | It increases |
| What considerations do you have to take into account with resource gathering? | Ethical Social Economic |
| What is energy transfer? | The movement of energy from one store to another e.g Muscles (Chemical) to Moving (Kinetic) |
| What was Richard Feynman's idea? | Looking at energy transfer is like children's building blocks, when one is missing, you look for it |
| What number of S.F should you give your answer in for a question? | The same number as the question gave you the figures in |
| What is the mean, median and the mode? | Mean = All added together divided by total number of numbers Median = Middle Mode = Most common |
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