Physics
Second and third class levers are differentiated by

The location of the load
The location of the fulcrum
The type of fulcrum present
The presence of multiple loads

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Physics
A cyclist leans inwards when he is negotiating a curve so that

Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
No frictional force may be produced between the wheels and the axle
He may increase his speed
His weight may be reduced

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