When the forces in a free body diagram donâ€™t change students often think that Newtonâ€™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.
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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