Many students use the written project report to satisfy their Phase II writing requirement. You'll need to have a laboratory notebook for recording observations and writing calculations. Your notebook won't be graded, but without one your project is sunk. Collaborating doesn't affect your homework grade, but on your homework you should explicitly identify with whom and to what extent you collaborated. In contrast, previous terms' homework solutions should not be used.
Late homework gets no credit.
Your project report should be entirely your own work, except as acknowledged in your references.