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Unformatted text preview: Summary of Facts for motional variables Distance cannot be negative while displacement can be (because of a choice of preferred direction). Likewise, speed cannot be negative while velocity can be. Speed = Distance/Elapsed time Vel. = Displacement/Elapsed time = (End point  Start point)/ Elapsed time Acceleration = (End velocity  Start velocity)/Elapsed time Speed and velocity are available from the distance/displacementtime plots as the slopes . Acceleration is available from the speed/velocitytime plots as the slopes. Look at plots and try to imagine what the motion is like! . Displ, Vel. Accel. Motional variables: Exercise.1 Lecture 1 introduced concepts that are crucial to a precise description of motion. Lets check your understanding of these. I walk 3 miles north and then 4 miles west. I have covered a distance of ___ miles. My displacement is ___ miles roughly ___ of ___. If my walk took 2 hr. what is my average speed? Motional variables: Exercise.2 Average speed = distance/ time My average speed is ___ mph. My average velocity is ___ mph roughly ___ of ___. What is my acceleration? There is no way to answer the question with the information given! Can you state why? Tortoise and the Hare Classic story about motion....
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 Winter '10
 LIM

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