Physics
Parabolic mirrors are used in

Dentists mirros
Car headlights
Driving mirrors
Shaving mirros

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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.
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
Should cars have bumpers that collapse under impact?

No, since the colliding car would then ram into the occupants and kill them
Yes, since they help to absorb the impact of a collision and keep the occupants safe
Yes, since the offending car should get damaged and pay for the mistake
No, since it would be very expensive to get the car repaired

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