Question

Summing Up 1. Can the meterstick platform be in equilibrium if the two upward support forces are equal to each other? If so, give an example from your observations. Yes, as shown in step 5: b we can see that both the support forces are equal (both 275g) and in upward direction. 2. Can the meterstick platform be in equilibrium if the two upward support forces are unequal? If so, give an example from your observations. Yes, step 6/7 illustrates this because the load is not evenly distributed (reading of left scale is 175g, reading of right scale is 400g), but is still in equilibrium. 3. Would the platform be in equilibrium if a 500-g mass were at the 30-cm mark and a 200-g mass were at the 60-cm mark? Explain. 4. Suppose the 500-g mass were placed at the 30-cm mark. Where could you place the 200-g mass so that both spring scales would have the same reading? Explain your answer. 5. Could you use the same masses to get both scales to have the same reading if the 500-g mass were placed at the 20-cm mark? If so, where should the 200-g mass be placed? If not, why not? This experiment centers on an experience with sign painters Paul Hewitt and Burl Grey (see page 27 in the textbook), which led to Paul studying physics. Thanks to Paul's friend, Howie Brand, for suggesting this experiment. WALKING THE PLANK

          Summing Up
1. Can the meterstick platform be in equilibrium if the two upward support forces are equal to each other? If so, give an example from your observations.
Yes, as shown in step 5: b we can see that both the support forces are equal (both 275g) and in upward direction.
2. Can the meterstick platform be in equilibrium if the two upward support forces are unequal? If so, give an example from your observations.
Yes, step 6/7 illustrates this because the load is not evenly distributed (reading of left scale is 175g, reading of right scale is 400g), but is still in equilibrium.
3. Would the platform be in equilibrium if a 500-g mass were at the 30-cm mark and a 200-g mass were at the 60-cm mark? Explain.
4. Suppose the 500-g mass were placed at the 30-cm mark. Where could you place the 200-g mass so that both spring scales would have the same reading? Explain your answer.
5. Could you use the same masses to get both scales to have the same reading if the 500-g mass were placed at the 20-cm mark? If so, where should the 200-g mass be placed? If not, why not?
This experiment centers on an experience with sign painters Paul Hewitt and Burl Grey (see page 27 in the textbook), which led to Paul studying physics. Thanks to Paul's friend, Howie Brand, for suggesting this experiment.
WALKING THE PLANK

Added by Luis Miguel J.

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