Clunk on wheels compressing over a speed bump is short control arm.

Clunk on wheels extending off a speed bump (or into a hole) is the long control arm.

Speed bumps are best for testing your suspension when you use enough speed to not bounce upwards but must also "fall" off the other side quickly without making it seem like ablow rider display.
So don't just ease over it slowly.

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course