When a moving bus comes to a sudden stop and the passengers lurch forward?
When the running bus stops suddenly, the passengers are jerked forward because due to inertia of motion the passengers tend to remain in their state of motion even though the bus has come to rest. Q.
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Because the lower part of the body comes to rest with the bus while the upper part tends to continue its motion due to inertia.
When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by Newton's first law. This is true because of the law of inertia when the bus was moving with some constant velocity hence passengers will also move with the bus.
When bus starts moving forward, lower part of the person begin to move with the bus whereas the upper part of the body tends to remain in rest due to inertia. Q. Assertion :When a bus starts suddenly, a person standing in it falls backwards.
Initially, the passengers and the bus both are moving in same direction. When the bus suddenly takes a sharp turn, the lower portion of passengers which is contact with the bus tends to move in that direction but the upper portion of the passengers throw an outside. This happens due to the INERTIA OF DIRECTION.
This is due to inertia of rest of upper part of the passengers body when the bus or train suddenly starts moving, the lower part of the passenger's body starts moving along with the bus or train while upper part of the body has a tendency to remain in the state of rest due to inertia of rest and hence falls backward.