could be a rod bearing, a main bearing, fuel octane too low, valve rocker arm too loose, transmission filter needs changing, timing advanced too far
Bad ball joint
Could be a rod knock. Your bearings slipping in the engine.
You need to get your car checked.
You have one or more tires out of balance.
Could most possibly the CV joint (constant-velocity joint)
kinetic (movement) energy is converted to sound energy due to the collision.
many many things, Loose lug nuts which lets wheel make knocking noise. Engine will make a knocking noise if it is really low on oil. Some timing belts make a knocking, slapping noise just before they break.These are just a few examples . Have someone ride in car with you as you duplcate the noise and see if they can determine which part of the vehicle it is coming from.
Get it fixed.
You forgot to let your wife in
your car being broke get it checked out
Because it just does. That's why.
It's really hard to understand what you're asking here."What causes a knocking sound when your car drops into a hole while driving?"If that's your question, I imagine that it would be the sound of your car dropping into a hole.