Decoding of relative motion of two moving points

• There are some geometric problems with multiple moving points , Moving a little more is dazzling , At this time, relative motion is the trump card to solve some moving point problems , But we must grasp the preconditions of use , That is, it must be rigid motion , Of course, there is another flaw that is simpler to use relative sports , That's it , The number of moving points is more than that of static points , Today, let's look at a topic like this

The original question is like this ：

Make it dynamic , Easy to see It's a reciprocating motion

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• I think of three ways to crack , There are other good ways , Welcome to exchange ！

Method 1 ： Profiteering crack

according to ：

Then there are ：

continue ：

Method 2 ： Geometry , Slant is greater than straight

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And come to ：

Method 3 ： Motion analysis , Relative motion method

Look at the , The original movement has two moving points , and , If we analyze it according to the master-slave linkage , It's not easy to analyze and understand

Since there are two moving points , Be quiet, there is only one , And satisfy rigid body motion , Try relative exercise ！ as follows

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