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.
He may increase his speed
His weight may be reduced
No frictional force may be produced between the wheels and the axle

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Physics
Acceleration is

Directly proportional to mass
Inversely proportional to force
Inversely proportional to mass
Directly proportional to force

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