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NEET-XII-Physics

10: Rotational Mechanics

with Solutions - page 3
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  • #10
    A uniform rod is kept vertically on a horizontal smooth surface at a point O. If it is rotated slightly and released, it falls down on the horizontal surface. The lower end will remain
    (a) at O
    (b) at a distance less than l/2 from O
    (c) at a distance l/2 from O
    (d) at a distance larger than l/2 from O.
    digAnsr:   c
    Ans : (c) at a distance l/2 from O.
    It is given that there is no force along x-axis.
    COM of rod will remain and will not shift along x-axis (horizontal direction).
    Force gravity is acting along y-axis (vertical direction). So, COM will shift along the y-axis by l/2 distance and COM of horizontal rod is at a distance l/2 from one end. Therefore, lower end of the rod will remain at a distance l/2 from O.
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