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Force applied to open or close a water tap is an example of,
(a)elastic collision
(b)conservation of momentum
(c)couple
(d)application of Newton's law of motion

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Important Questions on Force
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If the force applied to a body produces rotational motion in an anticlockwise sense, the moment of the force is considered as,

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The point at which the whole mass of the body is supposed to be concentrated, in order to study motion of the body in accordance with Newton's laws of motion is,

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The centre of mass of two particles lies

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Centre of mass of rectangular lamina lies on,

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Three equal masses each of are placed at the corners of a right angled isosceles triangle whose two equal sides are each. The position of the centre of mass of the system is,

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Point masses of and are placed at the corners of a square , respectively whose each side is long. The position of the centre of mass of the system is,

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The centre of mass of a system of two uniform spherical masses of and with centres of them apart is,

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A point through which total weight of the body always acts vertically downwards whatever may be the position of the body is,
