Physics
It is more difficult to walk on ice than on a concrete road because

There is more friction between the ice and feer
Ice is soft when compared to concrete
There is very little friction between the ice and feet pressing it
None of these

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Physics
Railway tracks are banked on curves

the train may not fly off in the opposite direction
necessary centrifugal force may be obtained from the horizontal component weight of the train
to avoid frictional force between the tracks and wheels
necessary centripetal force may be obtained from the horizontal component of the weight of the train

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