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Why are wheels of an automobile made cir...

Why are wheels of an automobile made circular ?

Text Solution

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Circular wheels roll on the road . Therefore motion of the vehicle is opposed by rolling friction which is much smaller than the sliding friction .
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Knowledge Check

  • The wheels of an automobile are locked as it slides to a stop from an initial speed of 30.0 m/s. If the coefficient of kinetic friction is 0.600 and the road is horizontal, approximately how long does it take the car to stop?

    A
    `4.22s`
    B
    `5.10s`
    C
    `8.75s`
    D
    `10.4s`

  • An automobile enters a turn whose radius is R. The road is banked at angle theta . Fricton is negligible between wheels of the automobile and road, Mass of automobile is m and speed is v . Select the correct alternative.

    A
    net force on the automobile is zero
    B
    normal reaction on the automobile is `mg cos theta`
    C
    normal reaction on the automobile is `mg sec theta`
    D
    net force on the automobile is `sqrt((mg)^(2)+(mv^(2)//R)^(2))`

  • Statement-1: The shape of an automobile is so designed that its front resembles the stream line pattern of the fluid through which is moves. Statement-2: The shape of the automobile is made stream lines in order to reduced resistance offered by the fluid.

    A
    Statement-1, is true, Statement-2 is true, Statement-2 is correct explanation for statement-1
    B
    Statement-1 is true, statement-2 is true, statement-2 is NOT a correct explantion for statement-1
    C
    statement-1 is true, statement-2 is false
    D
    statement-1 is false statement-2 is true

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