Passengers tend to get thrown to one side when a motorcar makes a sharp turn at high speed.
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Our body opposes the motion of the bus due to inertia, which resists changes in its state of motion. These questions and answers cover the key concepts of inertia and its effects during the sudden braking of a car and ...
Our feet start moving first when a bus starts suddenly because they are in contact with the floor of the bus, which moves with the bus.
When the bus begins to move suddenly, we tend to fall backwards because the bus and our feet in contact with the floor start moving, but the rest of our body opposes this motion due to inertia.
Safety belts exert a force on our bodies to make the forward motion slower, thus preventing collision with the panels and reducing the risk of injury.