It is common these days to see news stories about how to save fuel by changing your driving habbits. One of the main ways is to "avoid rapid starts and stops." I can see why rapid starts require more energy, but how does stopping the car briskly also use more energy?
Whether the car's momentum is lost through friction with the air and engine, or through friction with the brake pads, I can't see how it would make any difference.
2006-09-04 10:32:02 · 9 answers · asked by dp 2 in Science & Mathematics ➔ Physics
Fuel consumption rises rapidly the faster you go, so if you take your foot off the accelerator well before you need to stop, instead of braking sharply, you'll save gas, not to mention saving wear and tear on the engine, transmission, brakes and tyres.
2006-09-04 14:15:10 · answer #1 · answered by zee_prime 6 · 1⤊ 0⤋
A modern fuel-injected engine gets about the same fuel economy whether you accelerate rapidly or not. But when you floor the accelerator in an old gas-guzzler, it squirts a stream of raw fuel into the carburetor, spending a lot of gas for just a little more power. There, gradual acceleration made a big difference.
If you're driving attentively, you see that the light ahead has turned red. You conserve fuel by taking your foot off the gas and coasting, rather than continuing at a steady speed and then braking hard because you then need to stop quickly. You've covered that distance without expending more fuel.
2006-09-04 16:16:40 · answer #2 · answered by Frank N 7 · 0⤊ 0⤋
As far as 'braking' is concerned, anticipating the traffic patterns ahead means that you won't be doing hard braking. Therefore it's not the hard braking that's a concern, it the idiotic (wasted) acceleration, only to jam on your brakes seconds later. Any amount of breaking means that you spent the gas to get up to that speed, only to be 'wasted' when you apply the brakes.
I've heard competing thoughts about accelerating. One camp says to get up to 45 mph, as soon as possible. Other groups say slow and easy all the time.
... You decide.
2006-09-04 10:37:12 · answer #3 · answered by MK6 7 · 1⤊ 0⤋
The only way I can see that this would save fuel is that if you brake less severely you can maintain the cars momentum, and therefore use less fuel regaining your cruising speed. It only works for corners not for obstacles or emergencies..
2006-09-04 10:44:21 · answer #4 · answered by Mr D 2 · 2⤊ 0⤋
Avoiding braking rapidly does not improve fuel efficiency, thy just chuck it in there cause it reduces tyre and brake pad wear. Saving you money anyway.
2006-09-04 10:36:50 · answer #5 · answered by de5tiny06 2 · 0⤊ 0⤋
very simple when you drive fast and brake you change the kinetic energy into heat from the brake .but if you just go with a single speed no energy is changed to brake heat.
2006-09-04 10:43:05 · answer #6 · answered by nima_iran_1985 3 · 1⤊ 0⤋
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2016-09-30 08:26:53 · answer #7 · answered by esannason 4 · 0⤊ 0⤋
accelleration uses fuel! rapid accelleration wastes fuel
because it is not being used efficiently. rapid stoping
wastes the fuel used to get the speed. better to ease
off and coast to a stop or as near to it as is practical.
2006-09-04 10:40:07 · answer #8 · answered by Anonymous · 1⤊ 0⤋
High gear and low speed is a golden rule for fuel efficiency.
2006-09-04 10:47:13 · answer #9 · answered by Rustic 4 · 1⤊ 0⤋