Anonymous
Anonymous asked in Science & MathematicsPhysics · 1 decade ago

a force of 20N west moves its point of application south west for 70.7m. what work has this force done?

Errrrrr physics hw...what a bummer...please...help...

and you can't use the w= f x s rule, according to my evil science teacher, thats not the answer!!

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  • 1 decade ago
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    Let Force act on point O (origin)

    F = 20 N {west}

    displacement (s) = 70.7 m south-west

    ** the angle between Force and displacement vectors is 45 degree

    work done = Force * displacement in the direction of force

    W = F * (s cos 45)

    W = F s cos 45

    W = 20 * 70.7 * [1/√2]

    W = 20 * 70.7 * [0.707]

    W = 999.85 Joule

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