Learning objects
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A student completed a physics lab assignment involving the interpretation of a displacement-time graph. The graph showed the displacement of a medium over time. The student was asked to classify the velocity at 7 labelled points on the graph as positive, zero, or negative. They correctly identified points A and D as having zero velocity, and points E and F as having positive velocity, and points B, C, and G as having negative velocity. In their explanation, the student notes that velocity can be determined from the tangent line at each point, and whether the slope k of the line is positive, zero, or negative indicates whether the velocity is positive, zero, or negative respectively.
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Learning objects
- 1. Physics Learning Objects StudentName:SizhuangLiu StudentNumber:20091147 Lab Section:LH2 A Displacementvs.Time graphfora particularsegmentof amediumisshownbelow.Classifythe velocityof eachlabelledpointinto a) Positive: ____ ____ b) Zero: ____ ____ c) Negative: ____ ____ ____ Answer: a) Positive: E F b) Zero:A D c) Negative:BC G Explanation: The velocityisdependsonthe tangentline of the point.The equationisy=kx+b. If k is largerthan zero,the velocityispositive. If k is equal tozero (i.e.astraightline horizontal tothe x-axis),the velocityiszero. If k is smallerthanzero,the velocityisnegative.