Physics Paper 1 Key Topics

Ever wondered why a brick sinks but a massive ship floats? Density is your answer, and you'll need to master measuring it for both regular shapes (easy maths) and irregular objects (water displacement method). The exam loves throwing curveball questions about density comparisons.

Radioactive decay might sound scary, but it's just atoms having a bit of a breakdown. You'll write equations for alpha decay (loses 2 protons, 4 mass), beta decay (neutron becomes proton), and gamma decay (pure energy release). Half-life calculations are dead simple once you get the pattern - just keep halving the amount.

Understanding IV characteristics means you can read those voltage-current graphs like a pro. Different components create different curve shapes, and spotting these patterns will bag you easy marks.

Top Tip: Practice drawing decay equations until you can do them with your eyes closed - they're guaranteed exam points!

National grid questions test whether you understand why we use transformers and how energy loss works in power lines. Higher voltage means lower current, which means less energy wasted as heat - it's that simple.

Resolution in measurements determines how precise your readings can be. Better equipment = better resolution = more reliable results.

Nuclear fission (splitting atoms) and fusion (joining atoms) both release massive amounts of energy. Fission runs our power stations; fusion powers the sun.