Expert-Verified AnswerIf the bus suddenly moves going to North or forward, the passenger will tend to move backward or South. The passenger's movement is in opposite direction to the bus. The reason behind this one was because of the inertia in motion.
Since the bus is no longer moving as fast as that, you fly forward relative to the bus, until you hit something that stops you. This is a direct consequence of Newton's First Law: since there are no outside forces acting on you, you continue moving in a straight line at a constant speed.
This is because of inertia of motion. The part of our body, which is in contact with the bus, changes the direction of motion. However, the rest of the body tries to move in the same direction as before because of inertia of motion.
When a bus starts suddenly,its passengers tend to fall backwards because due to their inertia, the passengers tend to remain in a state of rest even when the bus starts moving.
When the bus accelerates from rest: When a bus abruptly starts moving, the passengers tend to slide backward due to inertia, as the passenger's inertia tends to oppose the bus's forward motion. Hence, the passenger tends to fall back when the bus accelerates forward.
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 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 bus abruptly starts moving, the passengers tend to slide backward due to inertia, as the passenger's inertia tends to oppose the bus's forward motion. Hence, the passenger tends to fall back when the bus accelerates forward.