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

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    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.
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    unit 2?????????
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    (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.
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    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.
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    I remember doing this past paper in class as well. Teacher said this question was a *****.
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    (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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