1. You see a ball at rest in the middle of a truck (which is also at rest). When the truck moves forward, the ball seems to roll toward the back of the truck. However, your friend claims that the ball didn't move! Physical explanation why this occurs using ideas of inertia and Newton’s First Law.

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!