What are the HARDEST questions in GCSE Physics Paper 2?

Make sure you can deal with these!
Here is my choice of the hardest questions you could get on Friday. Skip to the end for the hardest one...
#gcse #physics #revision #aqa #paper2 #examquestions
0:00 How to prepare
1:02 Force vector diagrams (HT)
6:03 Conservation of Momentum calc (SEP)
12:50 Radiation comparison
17:52 Orbits calculation