When transverse positive and negative pulses that have the same symmetric shape and size but travel...

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When transverse positive and negative pulses that have the same symmetric shape and size but travel...

When transverse positive and negative pulses that have the same symmetric shape and size but travel in opposite directions meet, is it necessary that there be a moment when the string or wire on which they move is flat? If so, how do the pulses "know" to continue moving on the string?
Two people on each end of a long rope send off a wave pulse. If both wave pulses are on the same side of the rope, describe what happens when the pulses meet. What about when the pulses are on opposite sides? What happens when one pulse is oriented at a 90^o angle to the second pulse?

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When transverse positive and negative pulses that have the same symmetric shape and size but travel...

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When transverse positive and negative pulses that have the same symmetric shape and size but travel...

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