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Gravity maybe?
When the bus suddenly stopped, several standing riders went flying forward. I enjoy flying a kite.
If the bus moves forward, yes
Yes--because of Newton's first law, the passenger wishes to stay in its constant state of motion, which is standing still in this case. Hence, when the train starts to move forward, the passenger will want to stay at the point he/she was and will fall backwards.
This is known as inertia. When the bus is acted upon by an unbalanced force the inertia of the bus differs but not of the person who is standing. So the person continues to be moving forward even if the bus decelerates suddenly until friction acts upon the person or the person catch holds of something and vice versa when the bus accelerates.
Inertia
Inertia
This is an example of the property of inertia. It is a body of mass' tendency to resist change in motion. The man was in motion at the speed of the bus. When the bus slows, the mass of the man resists change in motion and continues to move forward. It's basically the rebelliousness of matter.
Because you are decelerating sharply
yes my gerbil was grooming it self and suddenly he did one
this is because of the law of inertia
He could be shy or lazy, or maybe he just lost interest. Keep trying to talk to him, but don't be annoying. If he continues to ignore you, ask him straight forward why he's doing this. Maybe it might be time to move on.