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Work Done By Spring Forces...

Work Done By Spring Forces

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Knowledge Check

  • A block of mass m moving with a velocity v_(0) on a smooth horizontal surface strikes and compresses a spring ofstiffuess k till mass coines to rest as shown in the figure. This phenomenon is observed by two observers : (a) Standing on the horizontal surface (b) standing on the block To an observer A the work done by spring force is:

    A
    negative but nothing can be said about its mangnitude
    B
    `-(1)/(2) mv_(0)^(2)`
    C
    positive but nothing can be said about its magnitude
    D
    `+ (1)/( 2) mv_(0)^(2)`

  • In the figure shown initial spring is in unstretched state and blocks are at rest. Now 100 N force is applied on block A and B as shown in figure. After same time velocity of 'a' becomes 2 m//s and that of 'B' 4 m//s and block A displaced by amount 10 cm and spring is spring is streched by amount 30 cm . Then work done by spring force on A will be:

    A
    `9//3 J`
    B
    `- 6 J`
    C
    `6 J`
    D
    None of these

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