Hi- I have a quiz tomorrow on Newton's 1st and 2nd Laws. I'm kind of iffy with the second law, especially when it comes to impulse and impact. What is impact, and how can you measure impulse? For example, what if an object is dropped onto a soft couch, etc, etc.. basic theories... i haven't yet studied conservation of momentum so leave that out.. someone please explain the 2nd law and all that momentum/impact/impulse PLEASE!!