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16 January, 00:53

explain why it is easier to hang a shopping bag from the crook of your elbow than to carry it suspended from your hand with your arm at 90 degree angle.

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  1. 16 January, 01:48
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    A weight at the elbow exerts a downward force on the elbow.

    A weight at the hand, a perpendicular distance from the elbow, exerts a downward force and a bending moment.

    So hanging a bag from the crook of your elbow puts less stress on your arm.
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