Questions 11 and 12 refer to an object that can move along a horizontal line (the + position axis). Assume that friction is so small that it can be ignored. The object's velocity-time graph is shown below. 2 Time (s) Question 11: Describe in words the shapes of the acceleration-time and force-time graphs Question 12: Suppose that the force applied to the object were twice as large. Describe in words how the force, acceleration, and velocity vs. time graphs would be changed. Velocity

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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!