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PPT2-3

# PPT2-3 - Summary of Facts for motional variables Distance...

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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/displacement-time plots as the slopes . Acceleration is available from the speed/velocity-time plots as the slopes. Look at plots and try to imagine what the motion is like! . Displ, » Vel. » Accel.

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Motional variables: Exercise.1 Lecture 1 introduced concepts that are crucial to a precise description of motion. Let’s 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?

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Tortoise and the Hare Classic story about “motion”.
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PPT2-3 - Summary of Facts for motional variables Distance...

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