The stone of a hand flour grinder is provided with a handle near its rim. Give reason.

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Solution

The stone of a hand flour grinder is provided at the rim of the handle at the farthest distance from its centre. This is because as the perpendicular distance between the axis of rotation and the line of action of force increases, the force required decreases (since the moment of force increases).

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Explain the following :

(a) The spanner (or wrench) has a long handle.

(b) The steering wheel of a vehicle is of large diameter.

(d) It is easier to open the door by pushing it at its free end.

(e) A potter turns his wheel by applying a force through the stick near the rim of wheel.

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