Field notes
Short posts from an active AP Physics 1 classroom. The misconceptions students actually bring in, what their wrong answers reveal, and how the diagnostic is built to drill them out.
From the classroom
Slope vs. area on v-t graphs: whichever the eye reaches first
Velocity-time graphs encode three quantities, and students reach for whichever one the graph makes most visually salient. With a sample item designed to separate the slope failure from the area failure from the read-the-y-value failure.
Read noteAction-reaction "cancel out": why the third law looks like it predicts zero net force
The phrase "equal and opposite" sounds exactly like the language used for forces that cancel. Until students are forced to ask which object each force acts on, the third law looks like a contradiction.
Read noteMass vs. weight: the kg-vs-N gap that breaks every dynamics problem
Everyday English uses one word for two physical quantities. Until a problem leaves Earth's surface or asks for an FBD label, the conflation costs nothing. Then it costs everything.
Read noteCentripetal as an extra force: the FBD entry that doesn't exist
The textbook introduces centripetal force as a force law with a formula, looking identical to gravity and friction. Students draw it as a fifth arrow on the FBD, and the radial equation has too much in it.
Read noteVelocity vs. acceleration: the Unit 1 trap that hides all year
When students treat velocity and acceleration as the same vector, every later unit fights uphill against a confusion that should have been cleared in kinematics. Why it happens, what the wrong answers reveal, and where the platform drills it.
Read notePosition, distance, displacement: three words, three meanings, constant trouble
In English, they're synonyms. In physics, they aren't, and that gap shows up every time a problem has a turnaround. With a sample item that lets you see which of the three a student is actually confusing.
Read noteComing next
What field notes are
These aren't a blog about teaching. They're a focused log of misconceptions seen in a working AP Physics 1 classroom, written with other teachers in mind. Each note follows the same shape: the mistake, why it makes sense to the student, the correction, a sample item, what each wrong answer reveals, and where the platform handles it.
If a misconception you see in your room isn't here yet, the email's on the teacher page. Send it over.