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why does a car nose up when accelerating and nose down when braking?

which will have the greater acceleration rolling down an incline- a bowling ball or a volleyball?

  • physics -

    The bowling ball and the volleyball will have the same acceleration.

    I'm not exactly sure about the car thing, but it's probably because the front meets the most air resistance, pushing it down while accelerating, and when it brakes, the air resistance in the front is reduced while inertia keeps the car's end flying forward... the reduced air resistance and forward motion of the car's end lifts the front. I don't know a more technical explanation, if my original is true!

    I hope that helps, at least.

  • physics -

    1)consider the the torque on the car caused by the rear wheels. Remember Newtons third law?

    2) The volleyball will get to the bottom fastest.

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