Help with ID on 2 points

[FtWayne123]

I found the whiteish knife yesterday in my neighbors field here in Northeast Indiana. I'm pretty sure it's a knife, right? And from what time frame? (I cleaned it off, the material is spotted)

I found the flint arrowhead about 2 years ago in Northwest Kentucky. I haven't seen any before like it so what type is it?

I would also love to know what each was used for. What was the purpose for a knife? What was killed with an arrowhead of that size? I know I have lots of questions, but I'm always curious to know more.
-Alex

[Tdog]

My guess... preform and Lowe. Good finds.

[Steve Valentine]

Your first piece was probably discarded when they could remove the huge stack on the top side in your side view picture. They were more then likely going to make a Point from it.

The second piece is a Woodland culture Point and could be a Lowe as Tdog pointed out.