Force vs. Time on a Dynamics Cart (10:45)
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When the forces in a free body diagram don’t change students often think that Newton’s Second Law will yield the same results. This demonstration shows that is not true. This is a step-by-step analysis of tension force as a function of time for a dynamics cart in motion on a horizontal track.
Content Times: 0:13 Reviewing known information 0:47 The three parts in this demonstration 1:22 Drawing the two free body diagrams 2:27 Understanding the free body diagrams 3:12 Identifying the String Direction 4:08 Finding the Tension Force during Part #1 6:06 Theoretical vs. Experimental Tension Force during Part #1 6:28 Finding the Tension Force during Part #2 7:52 Theoretical vs. Experimental Tension Force during Part #2 8:13 Finding the Maximum Acceleration during Part #3 9:37 Instantaneous vs. Average 10:21 All the graphs sequentially |
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