Answer to Question #252891 in Mechanics | Relativity for kcarlacueto

Question

Let say, an observer is standing on the sidewalk watching your car in number 2. As it
sits at the red light the stuff toy is stationary relative to you. When the light turns
green and the car begins to accelerate to the right, the stuff toy remains stationary
relative to you until the force exerted on them by the string forces them to follow the
motion of the car. Is Newtonà ƒ ƒ ¢ € ™s law of inertia true to the observer? What about to you
who is sitting in the car?

Answer 1

When the light turns green and the car begins to accelerate to the right, stuff toys remain stationary relative to an observer until the force exerted on them by the string forces them to follow the motion of the car. So Newton's First Law is true for the observer stand on the sidewalk, but is not true when you are sitting in the car.