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I'm sure this is simple but I can't seem to get it. Watch

1. See the attached question, a. The answers are as follows:

i) Fairly simple to explain.
ii) p/3
iii1) p/3m
iii2) p/3
iv1)p/3
iv2)2p/3

I feel as if I kind of know why they are the answers but I'm not entirely sure how to explain it. Any help is greatly appreciated.
Attached Images

2. unit 2?????????
3. (i) Treat the whole thing as a block of mass 3m and use F=ma.
(ii) Use the value of a from (i), but consider cube 3 only; again, use F=ma.
(iii) Exactly the same as (ii)
(iv) You know the resultant force on cube 3. This is applied via cube 2. Use Newton's third law to find the force that cube 3 applies to cube 2. Since you already know the resultant force on cube 2, you can finally work out the force that cube 1 applies to cube 2.
4. Oh god, this isn't easy at all. The teacher showed us this in class and for the first time in a year and half I felt like running for the hills. It completely baffled me and I can understand why it looks simple. Momentum and force are GCSE. This, is not.
5. I remember doing this past paper in class as well. Teacher said this question was a *****.
6. (Original post by Ollie F)
Oh god, this isn't easy at all. The teacher showed us this in class and for the first time in a year and half I felt like running for the hills. It completely baffled me and I can understand why it looks simple. Momentum and force are GCSE. This, is not.
Yeah, i'm doing that **** now for gcse, it's a ***** :/

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