<p>For the Physics B free response, I heard that you don't need units in the calculations, only the final answer. Is this right?</p>
<p>I am pretty sure that this is incorrect; for all of the practice tests I've taken, there is always at least one free response question which gives points for correct units.</p>
<p>Either way, whether they're needed or not, I think it's always a good idea to include them. For the past year my Physics teacher has counted units for points, so I'm used to including them. Better safe than sorry...</p>