1motion1d

# 1motion1d - Distance and Displacement The displacement of...

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1 Distance and Displacement The displacement of an object is defined as the vector distance from some initial point to a final point. It is therefore distinctly different from the distance traveled except in the case of straight line motion. 1 2 x x x x 0 x Example: Distance is the total length that an object has moved. If I walk 2 km north, then 1 km south, the distance I have moved is 3 km. On the other hand displacement is the net change in position. My displacement is only 1 km. Frame of Reference Any measurement of position, distance, and/or speed must be made from an origin , which is a starting point from which to take further observations and measure, collect, and analyze our experiences.

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2 Speed Problem : If a dog jogs for 1.5 hours at an average speed of 2.22 m/s, how far does he go? How far means what is the distance he goes .
3 Velocity The distance traveled divided by the time is called the speed, while the displacement divided by the time defines the average velocity Average velocity is the displacement/(elapsed time). The rate over which displacement changes: Example: If it takes me 45 minutes to walk two km west, and one km east, then the average speed is 3.0/0.75 = 4.0 km/hour average velocity is 1.0/.75 = 1.3 km/hour. t x t t x x 1 2 1 2 v

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4 Ex1. A marathon runner runs at a steady 15km/hr.
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