Physics

12th

grade

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Circular Motion

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10 questions

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  • 1. Multiple Choice
    2 minutes
    1 pt

    A car is making a turn at speed v. The radius of the turn is r and the centripetal force on the car is F. If the car rounds the same curve at speed 2v, the required centripetal force is...

    12F\frac{1}{2}F

    FF

    2F2F

    4F4F

  • 2. Multiple Choice
    2 minutes
    1 pt

    A body of mass m moves in a horizontal circle of radius r at constant speed v for one complete revolution. Which of the following statements is incorrect?

    The angular velocity of body is directed perpendicular to the plane of circular motion

    The work done by the centripetal force is 2πmv22\pi mv^2

    The change in linear momentum of the body is zero

    The total energy of the body is constant.

  • 3. Multiple Choice
    2 minutes
    1 pt
    Image

    A straight length of tape unwinds from a roll rotating about a fixed axis with constant angular velocity, the radius of the roll decreasing at a steady rate. Which of the following graphs correctly shows how the variation of speed v at which the tape moves away from the roll with time t?

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