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Description
Flashcards by fahimarehman04, updated more than 1 year ago
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Created by fahimarehman04
over 10 years ago
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| Question | Answer |
| What is the formula for kinetic energy? | Kinetic energy=1/2mv2. Te breaking distance of a car increases with increasing speed. |
| What does this formula show work done by brakes = loss in kinetic energy? | Shows that when a car stops the kinetic energy changes into heat in the brakes. |
| What is the formula for the change in kinetic energy? | Braking force*braking distance=loss in kinetic energy. When speed of car doubles the kinetic energy quadruples., this is why there are speed limits. |
| What is fuel consumption data based on? | Dial road conditions for a car driven at a steady speed in urban and non urban conditions. |
| What are the factors that affect the fuel consumption of a car? | The amount of energy required to increase its kinetic energy. The amount of energy required for it to do work against friction. It's speed. How it is driven, such as excessive acceleration and deceleration, constant braking and speed changing. |
| Gives some info on electrically powered cars: | They are battery drives or solar powered. The battery takes lots of space. They have limited range of before recharging. They are expensive. Solar powered rely on the sun and so need back up batteries. Exhaust fumes from petrol fuelled cars cause pollution. |
| What are the advantages and disadvantages of solar powered and electrical powered cars? | Battery driven cars do not pollute local environment but battery needs to be recharged. Recharging uses electricity from a power station causing pollution and acid rain. Solar powered cars do not produce any carbon dioxide. Biofuels may reduce carbon dioxide emissions but this is not certain because deforestation leads to an increase in carbon dioxide levels. |
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