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Relative Motion

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by

Richard Datwyler

on 1 May 2014

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Transcript of Relative Motion

Relative Motion
Consider a stream
With a current going to the right at 5 m/s
5 m/s
and a boat crossing with a top speed of 7 m/s trying to cross the river.
7 m/s
If the river is 50 m wide, how long would it take to cross the river?





At this direction of motion how long does it take to cross the river?
What angle would be needed to arrive at a point directly across from where it started?
How far down stream would the boat land if it pointed its prow perpendicular to the flow of current?
v = 5 m/s
river
boat
boat
V = 7 m/s
V = -5 m/s
x
V = ?
boat
y
5 m/s
7 m/s
V = 3 m/s

angle = 60
going back to the first trip, with the boat moving in the Y direction only.
Passengers on the boat see and can magically measure the speed of a beaver coming at them at a speed of 3 m/s and an angle of 60 degrees from the vertical.

What is the beavers speed measured by people on land?
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