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Questions in this assignment pertain to both position-time and velocity-time graphs. When presented together, there is a strong probability that any confusion which a student has concerning the graphs will rise to the surface. As a first step in answering each question, make a mental note of which graph is being displayed. Then review the rules for that graph before looking for a reasonable answer. See Know the Law section.
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This is a position-time graph. The line starts out as a straight diagonal line. Ask yourself: What type of motion is consistent with a straight diagonal line on a p-t graph? Refer to the Know the Law section. Finally, the line changes its slope, remaining straight and diagonal but having a greater slope. Ask yourself: How is a steeply sloped line different than a gently-sloped line on a p-t graph? Refer to the Know the Law section. Be cautious and do not confuse your position-time graph with a velocity-time graph.
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Position-Time Graphs:
Position versus time graphs represent changes that occur in an object's position with respect to time. These graphs most commonly display horizontal lines, straight diagonal lines and curved lines. Horizontal lines represent an object at rest. Straight diagonal lines represent a constant speed motion. And curved lines represent an accelerated motion. The slope of the line is the velocity of the object.
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