Why do I forget physics concepts so quickly?

You forget physics concepts quickly because that's how human memory works. It's not a sign that something's wrong with you.

When you first learn something, your brain treats it as temporary information. Without reinforcement, most of it fades within days. This is called the forgetting curve, and it applies to everyone - even people who are great at physics.

Why physics is especially easy to forget

• Cramming creates fragile memory. If you learned a topic by cramming before a test, the memory was never durable in the first place. You had short-term recall, which is enough to pass a test but disappears within a week. Real retention requires multiple spaced reviews over time.

• Skills decay when unused. If you learned kinematics in September and haven't touched it since, your memory of it is fading whether you realize it or not. When it shows up on the final exam or the AP test, it feels like you never learned it at all.

• Passive review doesn't work. Re-reading your notes or rewatching a video feels like studying, but it mostly creates an illusion of knowledge. You recognize the material ("oh yeah, I remember this") without being able to actually use it. Real retention requires active retrieval - solving problems from memory without looking at your notes. This is related to why understanding the lecture doesn't mean you can solve the problems.

The fix

The solution is spaced repetition - reviewing material at the right intervals before you forget it. PhysicsGraph does this automatically. As you progress through the course, the system schedules reviews of older material at the optimal time, tracking what you know through the knowledge graph. You never have to wonder "what should I review today?" - just log in and do your daily work, and the system keeps everything fresh.