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Thread: Please help with these motion questions

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    Please help with these motion questions

    Hi I have completed the entire chapter in motion but I’m struggling with the following questions they are marked with the dots.

    https://imgur.com/gallery/EEgH9

    But listing the questions
    10c
    13b,e
    16d, e
    10b,c,d
    13a,b,c
    14d
    17b

    Can some kind soul please help if you want to see any solutions let me know

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    Re: Please help with these motion questions

    Doing a tiny part to set the ball rolling.

    Q10c: change of displacement means change in position(value of x): car started at x = 8m and ended up at x = 8m: so no change. So change in displacement is 0m. Therefore avg change in velocity = 0m/30 sec = 0 m/sec.
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    Re: Please help with these motion questions

    "Doing a tiny part to set the ball rolling."

    Is it in respect to Awesomeness ahaha? dx/dA where A measures Drongos Awesomeness!




    EDIT: Any specifics which are hard?
    Last edited by HeroWise; 18 Apr 2018 at 9:37 PM.
    Drongoski likes this.

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    Re: Please help with these motion questions

    Quote Originally Posted by HeroWise View Post
    "Doing a tiny part to set the ball rolling."

    Is it in respect to Awesomeness ahaha? dx/dA where A measures Drongos Awesomeness!




    EDIT: Any specifics which are hard?
    Can you please check 12b and 12e of my solutions ?

    https://imgur.com/gallery/hBom51S

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    Re: Please help with these motion questions

    Quote Originally Posted by kpad5991 View Post
    Can you please check 12b and 12e of my solutions ?

    https://imgur.com/gallery/hBom51S
    I figured out all except 13b,13c and 14d and 17b please help with these

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    Re: Please help with these motion questions

    Q17b

    acceleration a = -2cos t is positive if -2cos t > 0
    i.e. if cos t < 0
    Now cos t is < 0 for pi/2 < t < 3pi/2 (if you are familiar with the graph of y = cos t)and again and again later every 2 pi secs later.


    For Q14, if you can do parts a, b and c, you are already doing very well.

    For Q14d: 1st 4 secs, particle moves 32m to the right. 4 secs later it reverses direction (moving left) and returns to its original position, travelling another 32m. 2 secs later, it moves another 40m to the left. Therefore in the 10 secs, particle has travelled 32m + 32m + 40m = 104m. .: avg speed = 104m/10 sec = 10.4m/sec. (its position at t = 10 sec is x = -40m, i.e. its displacement is -40m)



    I think many of these questions are rather difficult for students of 2U Maths. Problem is not that the area is all that difficult. Problem I think is, even before you do the questions, most people do not have a good idea of basic and simple concepts of distance, displacement, velocity and speed. You also need to know basic differentiation and integration.

    I don't know how you have been taught. I would just love to stand before a class to make all these ideas clear, before you embark on working on the exercises on motion.
    Last edited by Drongoski; 21 Apr 2018 at 6:13 PM.
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    Re: Please help with these motion questions

    Can someone please help with 13b I got i but how is the distance 600m during the next 30 seconds

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    Re: Please help with these motion questions

    And 13 b iii

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