How your course grade will be determined:

Each test is worth 20% of your grade, and the final is worth 40%. If your numerical score on the final is higher than a test score, your score on the final replaces that test score. Your projects (presentation and writeup) plus the lab you turned in are worth 20% of your grade.

From all of these inputs you will have a final numerical score between 0 and 100. Those numbers will be plotted up for me to contemplate. Almost certainly there will be clumps. Letter grades (from A to C-, to D, to F (an uncommon occurrence) ) will be asssigned to the clumps. There is no law that says either what numerical range corresponds to a particular letter grade nor how many of any letter grade there ought to be. So, everyone could get an A or everyone could flunk, although those are very remote possibilities. Please note that this means that 70 is not the dividing line between passing and failing.

After grading the final exam, I'll have a general sense of how good your collective performance has been, and that will determine whether a particular clump ought to be, say, a B or a B-.

Generally, if you've learned something in the last 3.5 weeks and you can demonstrate that on the final, you're going to pass the course. It's very rare that anyone works hard in a physics course and flunks.