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You put your book on the bus seat next to you. When the bus suddenly stops, the book slides forward off the seat. Why?

(A) a net force acted on it
(B) No net force acted on it
(C) it remained at rest
(D) it did not move, but only seemed to

1 Answer

  • Newton's first law states that when viewed in an inertial reference frame, an object either remains at rest or continues to move at a constant velocity, unless acted upon by an external force.
Answer: no net force acted on it
The book was initially moving forward (because it was on a moving bus).
When the bus stopped, the book continued moving forward, which was its initial state of motion, and therefore it slid forward off the seat.
answered Aug 19, 2014 by balaji.thirumalai

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