A train at rest tends to move from the platform and it attains a speed of $100 k m / h r$ after a few minutes. While trying to attain that speed, what force(s) does it need to overcome?

Static Friction

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Rolling friction

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Cohesive friction

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No friction was observed

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Solution

The correct option is A Static Friction
When an object begins to move from rest, the frictional force acting on the object is called static friction. This static frictional force has to be overcome by any object to come into motion.
Since the train attains a speed of $100 k m / h r$ it is supported by the rolling friction and not opposed by it. Thus in absence of rolling friction, the train won't move in the first place.

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A train at rest tends to move from the platform and it attains a speed of 100 km/hr after a few minutes. While trying to attain that speed, what force(s) does it need to overcome?

A train at rest tends to move from the platform and it attains a speed of $100 k m / h r$ after a few minutes. While trying to attain that speed, what force(s) does it need to overcome?