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Why does the spinning of wheels move a car?

  1. Mar 11, 2017 #1
    1. The problem statement, all variables and given/known data
    why does the spinning of wheels move a car?

    2. Relevant equations


    3. The attempt at a solution
    The wheels spin backwards pushing on the road, friction opposes this spinning motion. But why does this result in the car moving forward? friction can only increase to be equal and opposite the force of motion
     
  2. jcsd
  3. Mar 11, 2017 #2
    Think this way,We can accelerate only the force that acts on our body ,system etc.When Car's wheels spin it creates a force which pushes the ground backward.So ground makes us move forward as the same amount.
     
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