A) inertia of passenger
B) inertia of train
C) gravitational pull by earth
D) none of the above
Correct Answer: A
Solution :
Newton's first law of motion states that an object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. In fact it is natural tendency of objects to resist changes in their state of motion. This tendency to resist changes in their state of motion is described as inertia. Because of inertia the upper part of the body of the passenger is in the direction of initial velocity of train while lower part stops with stop of train. Hence, passenger moves forward when the train suddenly stops.
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