kinetic (movement) energy is converted to sound energy due to the collision.
A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
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.
The water hitting the ground.
Having a bad rod bearing could cause a truck to make a loud knocking noise and shake when driving at high speeds. The engine having a coolant leak or an engine timing problem could also cause the knocking noise.
wierd
you make noise on a xylophone by hitting different keys with a mallet. depending on the size of the key, you get a different pitch.
your cv boot has torn and needs replacement
Compressor is unbalanced as the rpm's drop.
A knocking/clicking noise when making a turn is a sign of a torn CV boot. In this case it's the driver side boot that is torn.
it's probably a rod knocking
When not moving: No noise When hitting another solid: Clink When hitting water: Plop When melting: Sizzle
The knocking that you are describing reminds me of a stuck universal joint. A bent axle usually wears tires out very fast more than making noise.