Wave Direction: Understanding the Relationship Between Points and Answers

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The discussion centers on understanding wave direction and the movement of points along a wave. It clarifies that the wave itself moves past a stationary point rather than the point moving down the wave. The relationship between the wave's crests and the position of the point is crucial for determining the point's next state. A visual aid, such as shifting the wave's position, helps illustrate this concept effectively. Ultimately, the point's new position indicates an upward direction, confirming the understanding of wave dynamics.
Cici2017

Homework Statement


Screen Shot 2017-09-10 at 5.47.16 pm.png

Homework Equations

The Attempt at a Solution


the point is going down the wave, so shouldn't the answer be D? Why is it B? Thank you! [/B]
 
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Look at the wave crests, they are moving to the right. What happens "next" at that point depends on what is just to the left of the point.

PS The point doesn't move down the wave. The wave moves past the point.
 
CWatters said:
What happens "next" at that point depends on what is just to the left of the point.

Can you please explain this more? I don't get it ~ Thank you!
 
Try this...
Print out the drawing.
Draw the wave shifted to the right about 1/4" or 5mm.
Mark on it the new position of the point
If possible post your sketch here.
 
CWatters said:
Try this...
Print out the drawing.
Draw the wave shifted to the right about 1/4" or 5mm.
Mark on it the new position of the point
If possible post your sketch here.
ahh~ I think I got it. the new position of the point is higher than the old position, so the direction is up. Am I right?
 
Correct.
 

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