Consider the following information:
Newton’s first law of motion states that an object continues to be in a state of rest or motion unless it is acted on by an external force. The net force acting on the body is the total of all the forces acting on the body. Newton’s first law is sometimes called the law of inertia, which is the tendency of an object to resist changes in velocity. Inertia of an object is directly proportional to its mass.
A book is placed on a dashboard of a car that is stopped at a traffic light. As the car starts to move forward, the book slides off the dashboard. Pick the most correct explanation for the book sliding off the dashboard.

B. Due to inertia, the book slides off the dashboard.


Inertia is the book’s resistance to a change in its state of motion. The book remained at rest and did not move forward with the car. Choice B is correct

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