Trains generally only take slow gentle curves. If a train takes a curve too shar

Question

Trains generally only take slow gentle curves. If a train takes a curve too sharply, it is likely to fly off of the track. Why is this? The train tends to keep moving in a straight line. If there is not enough force provided by the tracks, the train will derail. When a train accelerates too quickly, it becomes weightless for a short period of time during which it can easily lift off of the tracks and derail. Because train wheels are a fixed vertical distance apart, trains have a hard time taking sharp turns quickly. (The vertical distance is the distance between the side wheels.) Because train wheels are a fixed horizontal distance apart, trains have a hard time taking sharp turns quickly. (The horizontal distance is the distance between the front and back wheels.)

Explanation / Answer

By Newton's law of intertia if an object rests at stays it will be in stay and if an object arw moving it will be keep moving unless an unbalanced force are applied on object.

So by the above rule if centrifugal force must equals to centripetal and so inertia works properly and train will not be derail.

So the correct answer is option (a).

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