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PHYSICS PRACTICAL ALT B

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(3bi)
A couple, in the context of oscillatory motion, refers to a pair of forces that are equal in magnitude, opposite in direction, and act on opposite sides of a pivot or fulcrum, causing rotation or torsion.

(3bii)
(i)Screwdrivers: When you use a screwdriver to tighten or loosen a screw, you are applying a couple. The force you apply to the handle of the screwdriver is transmitted to the tip, causing the screw to rotate.
(ii)Steering wheels: When you turn a steering wheel, you are applying a couple. The force you apply to the wheel is transmitted to the axle, causing the wheels to turn and the vehicle to change direction.