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Distance traveled per time unit, for example - per hour, goes up linearly with the speed. So double speed means double miles per hour.

Some resistances, such as wind resistance for example, increase nonlinear with speed (velocity). Wind resistance increases as something like the third power (speed cubed). So double speed can mean eight times the wind resistance losses. Lubricants, such as oil show similar nonlinear losses.

Distance traveled in a unit time increases only linearly with speed. Thus the gain, distance traveled, has gone up less than the efficiency losses.

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12y ago
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5mo ago

Lorries experience increased air resistance at higher speeds, requiring more power to overcome it. Additionally, faster speeds often require the engine to work harder, leading to higher fuel consumption and energy usage. This combination of increased air resistance and engine exertion results in lorries using more energy when they go faster.

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Q: Why do lorries use more energy when they go faster?
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Why do lorries use more energy when they are travelling faster?

Lorries experience increased air resistance at higher speeds, which requires more energy to overcome. Additionally, higher speeds can lead to increased rolling resistance and more frequent gear changes, further increasing energy consumption.


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Friction increases with speed because at higher speeds, there are more interactions between the surfaces of objects, leading to greater resistance as they move against each other. This increased interaction generates more heat and wear, resulting in higher friction forces.

Related questions

Why do lorries use more energy when they are travelling faster?

Lorries experience increased air resistance at higher speeds, which requires more energy to overcome. Additionally, higher speeds can lead to increased rolling resistance and more frequent gear changes, further increasing energy consumption.


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