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22 Cards in this Set
- Front
- Back
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What happens when speed doubles?
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-Kinetic energy quadruples -Braking distance quadruples |
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What affects thinking distance? |
-Tiredness -Drugs/alcohol -Fog/ poor visibility -Speed |
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What affects braking distance?
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-Bald tyres -Wet roads -Worn brake pads -Speed |
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What is work done? |
When a force moves |
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What happens when mass doubles?
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Kenetic energy doubles |
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What happens when velocity doubles? |
Kinetic energy quadruples |
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What affects fuel consumption? |
-Windows open -Size of a car -Weight -How long you are stationary |
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What are the advantages of electric cars? |
-Lower emmisions -Don't have to pay for fuels -Less noise pollution |
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What are the disadvantages of electric cars? |
-Cars are expensive to buy -Takes a while to charge -Would not be able to travel a long way as it is only lasts 6-8 hours |
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How does a seatbelt work to minimise injury?
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It stretches so that some of the kinetic energy is converted to elastically energy. |
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How does a crumple zone reduce injury's? |
It absorbs some of the cars energy by changing shape or crumpling.
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How does an air bag reduce injury's?
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It absorbs KE by squashing up around the passenger. |
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What do all safety features do?
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-Absorb energy -Reduce injury -Reduce momentum to zero more slowly to reduce the force on the cars occupant. |
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Name some features that prevent a crash? |
-Anti-lock brakes -Traction control -Cruise control -Electric windows -Paddle shift |
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Name some features that protect the occupants if a crash occurs? |
-Air bag -Crumple zone -Seatbelts |
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How does paddle shift work?
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It allows driver to operate gears, lights, stereo and wipers without taking hands of steering wheel or eyes of the road. |
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How does ABS brakes work? |
It gives a vehicle stability and maintains steering when breaking hard or going into a skid. Works by the driver applying hard continuous pressure which activates the anti lock brakes which then work by automatically pumping on and off to avoid skidding. |
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How does traction control work? |
It stops the wheels from spinning when accelerating quickly. Provides maximum grip and stability. |
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How do you test the safety features on a car |
-Computer simulations -Testing with models/dummies |
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How does an average speed camera work? |
It recognises number plates to find time over a measured distance |
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How does a speed camera work? |
By working out speed using the lines on the road to give distance and the time between the flashes. |
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