Dust maybe, but dust moving at several thousand KPH which would quickly destroy satellites.
First, force is mass times acceleration. Incredibly small mass does mean a highly reduced force. There is damage, but don't forget how small satellites are. Major problems can be seen, and avoided: the more common dust-sized specks come under acceptable risk. They might damage the outer casing, but that's minimal.
Bull. At that speed they would go straight through those flimsy satellites like a rifle bullet.
Can you provide some analysis that shows that's likely?
I calculate that a 9mm Parabelum bullet has muzzle energy of around 500 joules, while a 1mg sand grain sized meteor traveling 50km/s has a max impact force or around 1250j.
500j sounds a shade low for a 9 mm but close enough for discussions like this. Your kinetic energy calculation for 1 mg travelling at 50 km/s is correct. 50 km/sec may be a bit high for these things, but, again, within the realm. On the other hand, a sand grain with a mass of 1 mg is going to be on the order of 1 mm in dimension. That ain't dust, which is what we're discussing. Interplanetary dust particles in the vicinity of the Earth's orbit are on the order or 10 - 100 microns (0.01 - 0.1 mm); at the large end of this spectrum, 100 microns (0.1 mm), is 1000 times less volume per particle (10
3 = 1000) and, thus, 1/1000 the mass, presuming the composition is the same. The KE of a 1 µg
dust grain with 50 km/sec velocity would be 1.25 j; 0.25% of the 9mm bullet's energy, using your numbers.
Something sand-grain size is a pretty large meteoroid. Remember, "dust-sized specks come under acceptable risk" was the assertion. I highlighted it in the quote block for your convenience.