Originally Posted by
bigcountry
Is this correct? I thought BC was your friction coef (drag) in force vector analysis. I didn't know SD was part of it. You could be correct, just didn't know that.
Just did some research, guess your correct.
The best way to explain why in simple terms is that "An object in motion tends to stay in motion unless acted upon by an external force". For a bullet the external force is air resistance. For both the copper and lead bullet of the same shape the air resistance is actually the same.
The reason the lead bullet carries its velocity better is that its additional weight makes it harder too slow down due to higher FT/LBS momentum. So more air resistance is required to stop the object of greater mass.