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•IV. Force, Motion and Mechanical energy •A. Relative Motion •7th grade assessment
•Science standards 1.1; 1.2; 1.4; 1.8; 3.1; 3.5 •Students should be able to organize data concerning the direction and position of a moving object with respect to time in a graphical form.
•Click mouse to view sample questions and answers on last slide.
•Determine the speed of an object using measurements of distance and time. Compare the results both numerically and graphically.
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You can show the motion of an object on a line graph in which you plot distance over time.
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• A point on the graph represents the location of an object at a particular time. • Time is on the x-axis and distance on the y-axis. • A straight line represents motion at a constant speed. • The faster the motion, the steeper the slope. 0 1 2 3 4 5 6 7 • A horizontal line represents an object that is not moving at all. Time (min)
Distance (m)
Calculating Speed
• Divide the distance by the corresponding time to find speed. • Speed = 600 m =200 m/min 3min • How far does the runner run in 6 minutes? • 1200 meters • How long does she run to travel 1000 meters? • 5 minutes
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Distance (m)
800 600 400 200 0 0 1 2 3 4 5 6 7
Time (min)