Objects sometimes move on a medium also moving to an observer Ex airplane wind observer Ex motorboat current observer The magnitude to the observer will not be the same as that on the vehicle Motion is measured relative to the observer stationary observer Tailwinds Headwinds and Side Winds A tailwind is a wind that approaches from behind Increases the resulting velocity A headwind is a wind that approaches from in front Decreases the resulting velocity A side wind is a wind that approaches from the side Pythagorean theorem must be used to determine resulting velocity Direction determined using trigonometric functions SOH CAH TOA measured due east Analysis of a Riverboat s Motion If a motorboat were to head straight across a river it would not reach the shore directly from the starting point River current has influence on boat motion Downstream carry Speed will be greater in respect to an on shore observer Can be determined as plan would Pythagorean Theorem SOH CAH TOA Usually accompanied by three questions What is the resultant velocity magnitude and direction If the width of the river is X meters wide then how much time does it take to travel shore to shore What distance downstream does the boat reach the opposite shore Average speed equation ave speed distance time
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