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New guy to physics having trouble

  1. Jan 7, 2013 #1
    ***new guy to physics having trouble***

    Hey guys :) I'm just a guy who got into physics two days ago, been reading into it, watching videos and some history and I'm having a problem, a youtuber 'thenewboston' has a physics series and I am currently on his 4th video which he has called:

    Physics Lecture - 4 - Calculating Distance Traveled

    Link:



    If you skip to 6:03 The equation is the problem I am having, I can not comprehend it no matter how many times I watch the video.

    I already know the answer to the question is 313.6 Meters Although I do not know how to calculate it according to the formula and the only reason I know how to get the answer is because people have said in the video's comment section that the answer is 313.6 Meters.

    This is what I did to get the answer

    4.9 X 4 = 19.6 Meters

    .5 (1/2) X 9.8 X 4 = 19.6 Meters

    _____________________________

    1) 4.9 X 4 = 19.6

    2) 19.6 x 4 = 78.4

    3) 78.4 x 4 = 313.6

    313.6
    ________________________

    Ans = 313.6 Meters

    I hope you can help and thanks in advance guys!
     
    Last edited by a moderator: Sep 25, 2014
  2. jcsd
  3. Jan 7, 2013 #2
    Re: ***new guy to physics having trouble***

    Why are you multiplying everything by four? You put an 8 where the t is in the equation and go from there. That gives you 8 squared=64 times 9.8 = roughly 640. Then you take half of that gives you roughly 320, which is the 313.6.
     
  4. Jan 7, 2013 #3
    Re: ***new guy to physics having trouble***

    The reason I was multiplying everything by four is to prove, as I said above that I do not know the formula but that is how I got the answer 313.6 ..... and so on with that.

    "That gives you 8 squared=64 times 9.8 = roughly 640. Then you take half of that gives you roughly 320, which is the 313.6."

    Thanks, I understand how to get it now but how does the 320 = 313.6 would you mind explaining that?

    and if it isnt too much of a bother would you mind giving me a similar example and using your theory I will see what answer I get and hopefully it is correct
     
  5. Jan 7, 2013 #4
    Re: ***new guy to physics having trouble***

    64 times 9.8 = 627.2, divide that by 2 and you get 313.6. I just rounded the gravity to 10 instead of 9.8, that's where I got the 320.

    Well, it is kind of a bother, but what the hell! O.k. say you drop the tuna can for 14 seconds, how far would it fall?
     
  6. Jan 7, 2013 #5
    Re: ***new guy to physics having trouble***

    14 Squared = 196 x 9.8 = 1920.8 / 2 = 960.4

    Ans = 960.4

    Hopefully that is correct :)
     
  7. Jan 7, 2013 #6
    Re: ***new guy to physics having trouble***

    By Jov, I think yo've got it!
     
  8. Jan 7, 2013 #7
    Re: ***new guy to physics having trouble***

    Just remember who got you started when you win the Nobel..
     
  9. Jan 7, 2013 #8
    Re: ***new guy to physics having trouble***

    Yes! I got it!!!! Thankyou!!!!
     
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