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Thread: collision

  1. #1
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    collision

    Two smooth spheres of masses km and m collide obliquely. the sphere of mass m is brought to rest by the impact. the coefficient of restitution for the collision is 1/k (k greater or equal to 1) Prove before the impact the spheres were moving perpendicular to each other.

    i have worked out k=-1. I know the sphere of mass m was xi+0j before and 0i+0j after.
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  2. #2
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    Re: collision

    i have worked out the first part
    the second part of the question is show that as a result of the collision the kinetic energy lost by the sphere of mass m is k times the kinetic energy gained by the sphere of mass km.
    the kinetic energy lost by mass m sphere is .5mx^2
    kinetic energy gained by mass km sphere is .5(km)(y)^2-.5(km)(a)^2
    Any help?
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  3. #3
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    Re: collision

    Hey markosheehan.

    What is the coefficient of restitution defined as?
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  4. #4
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    Re: collision

    The coefficient of restitution is a number which indicates how much kinetic energy (energy of motion) remains after a collision of two objects.
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  5. #5
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    Re: collision

    Hint - Do you have a formula in terms of kinetic and potential energy with regard to final and initial states?
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  6. #6
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    Re: collision

    sorry
    can you give me any more hints i am still stuck
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