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Maths & Physics Help

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astarmathsandphysics:
Post your O Level questions here to get the answers back asap from someone with 3 maths/physics degrees.

justx007:
Why does a car brak system use oil  whereas for lorries, some uses  air ?

astarmathsandphysics:
 think it is because a truck can use it's own weight - up to 40 tonnes - to compress the air that applies the braking force. A car weighs 2 tonnes max, so they have touse oil, which is virtually incompressible. That way, the braking is instant. I will check with a mechanic I know.

astarmathsandphysics:
I have been told this by my mechanic friend

Normal car brakes operate by using pressure to apply the brakes, but if you somehow lose your brake fluid, you lose all braking. This is why some trucks have the opposite. The reasoning behind this is that if you blow an air line or lose pressure to the brakes, the brakes will apply and stop the truck. They won't come off again until they are pressurised. It's more of a safety factor... I don't like the idea of a truck with no brakes.

Amna M.:
How can I get good at vectors? I've revised the topic a million times and practised every question I found, but I've only improved a little!

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