Physics
A ball rolling along the ground gradually slows down and finally comes to rest is due to ________

Magnetic force
Friction
Muscular force
Electrostatic force

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Physics
Railway tracks are banked on curves so that

Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train
The train may not fall down inwards

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