When a passenger who is standing and facing forward in a moving bus suddenly falls forward?
When a bus stops suddenly, its passengers tend to fall forward because due to their inertia the passengers tend to remain in a state of motion even though the bus has come to rest.
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A getting passenger getting down from a moving bus, falls in the direction of the motion of the bus. This is because his feet come to rest on touching the ground and the remaining body continues to move due to inertia of motion.
The correct answer is Newton's first law. ?Newton's first law states that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by force. This postulate is known as the law of inertia.
This is due to inertia. When the speeding bus stops suddenly, lower part of the body comes to rest while the upper part of the body tends to maintain uniform motion. Hence, the passenger's are thrown forward.
The man jumping out from a moving bus possesses the inertia of motion. As the man lands on the gorund, feet come to rest immediately while the upper part of body continue to move due to inertia of motion and hence the person may fall forward.
When a person alights from the bus, his body would try to continue moving in the direction the bus was moving due to inertia. But as soon as both the feet touches the ground, the lower part of the body comes to rest while the upper part gets carried away under the effect of inertia resulting into his forward fall.