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Homework Help: Torque and wheels

  1. Mar 2, 2008 #1
    I wasnt sure where to post my question. Here goes:

    I have a car with 4 wheels and one motor.
    The motor drives an axle connected to the back wheels.
    The total mass of the car is 1000kg
    Each wheel weighs 20kg and is a solid cylinder
    The effective frictional force is 0.2
    The radius of the wheel is 0.5m
    The radius of the axle is 0.05m


    If I would like to accelerate at 12m/s from rest:
    What is the required torque on each wheel?
    What is the required motor torque?

    Here is my lame solution which I think is pretty incorrect:
    F = ma * m/g + um
    Fwheel = (ma * m/g + um) / 4
    Twheel =( (ma * m/g + um) / 4 ) * radius
    Twheel = ( (1000*12 * 1000/9.8 + 0.2*1000) / 4 ) * 0.5
    Twheel = 153086.2 Nm
    Tmotor = 4*Twheel = 612344.9 Nm

    I think maybe you need Io = (MR^2) / 2
    But i dont know
     
    Last edited: Mar 2, 2008
  2. jcsd
  3. Mar 3, 2008 #2
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