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Thread: Thought Provoking 2

  1. #1
    spoons
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    Default Thought Provoking 2

    A car is travelling at 70mph down a motorway....

    When the tyre hits the road surface its travelling at 0 mph

    So if each tyre is hitting the road surface at 0mph.... how is the car being propelled forward
    Last edited by spoons; 6th August 2007 at 12:23.

  2. #2
    On a Sabbatical VauxVeteran's Avatar
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    Yes, it's on a trailer.

  3. #3
    spoons
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    Quote Originally Posted by VauxVeteran View Post
    Yes, it's on a trailer.
    Nope..

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    Regular Member yorkshireborn's Avatar
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    Default

    at the point of contact between tyre and road.

    Quote Originally Posted by spoons View Post
    A car is travelling at 70mph down a motorway....


    So if each tyre is hitting the road surface at 0mph.... how is the car being propelled forward
    easy engine , driveshaft.

  5. #5
    Full Member Jay Kay 313's Avatar
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    Taken the speed sensor's off the wheel's
    Astra Estate SRi XP 1.7 CDTi 100

  6. #6
    Regular Member parapaul's Avatar
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    How can the tyre be doing 0 mph unless the car is at a standstill?

    If the car's stationary, the angular acceleration of the drive wheel (provided by the torque of the engine) and the friction between the tyre and the ground will propel the car forward.

    If the car is already moving, the wheel has an angular velocity, and again the friction between the tyre and road will keep the car moving.

    If you had a car on a perfectly frictionless surface (the kind only found in physics textbooks ) then the wheels would spin and the car would remain stationary. Therefore the wheels can't be at 0 mph.

    Clear as mud?

  7. #7
    spoons
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    Quote Originally Posted by parapaul View Post
    How can the tyre be doing 0 mph unless the car is at a standstill?
    A tyre during its rotational journey has to come into contact with the road. At the point of contact with the road surface it is at equal speed to the road surface = 0mph regardless of the vehicle speed being 70mph

  8. #8
    Regular Member parapaul's Avatar
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    OK, but the time that it is at 0mph is infinitely short. And as nobody seems to be able to develop a tyre with a 100% friction coefficient, there will be a certain amount of slipping as it rotates.....

    Your go

  9. #9
    spoons
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    In physics, the point at the bottom of a rolling wheel is instantaneously stationary.

    Perfectly stationary.... so what is moving and what is causing the tyre wear ??

  10. #10
    Regular Member parapaul's Avatar
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    The fact that we don't have 100% friction between the wheel and the road, and as the tyre slips, it wears.

    If only the world was based on a physics model rather than the other way around....

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