Your car axle is connected to the frame with a spring. Just a spring alone would create a very bouncy ride so there is also a shock absorber that slows the bounce down. Your best bet when it comes to mechanical questions is to watch old Jam Handy films on YouTube. This one is from 1938 and can tell you all you need to know. https://youtu.be/ej7CRAIGXow
There’s also a great one about transmissions and another about differentials.
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