Emily is standing in a moving bus, facing forward, and suddenly falls forward as the bus comes to an immediate stop. What force caused her to fall forward?
A) The force of gravity.
B) The normal force due to her contact with the floor of the bus.
C) No forces were responsible for her fall.
D) The force due to static friction between her and the floor of the bus.

Question

Emily is standing in a moving bus, facing forward, and suddenly falls forward as the bus comes to an immediate stop.  What force caused her to fall forward? 
A) The force of gravity.
B) The normal force due to her contact with the floor of the bus.
C) No forces were responsible for her fall.
D) The force due to static friction between her and the floor of the bus.

ash2326 · Answer

@Kilochan  What's the law of inertia says?