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Physics Lecture – 9 – Vector Subtraction
Comments
49 responses to “Physics Lecture – 9 – Vector Subtraction”
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So vector subtraction is vector addition for forces working against each other, not together? The trucks were working together, so you used vector addition to find the force and direction, the plane and wind are working against each other, so you subtract to find the force and direction? Also I noticed with addition you moved the tail of one force to the end point of another force, but for subtraction you keep the direction of the force the same, since they're working against each other.
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You're videos are awesome and I understand you really well although I'm in year 6.
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in basic algebra with real numbers we assume that substraction is addition with one argument multiplied by -1. BUT IS THIS THE SAME IN LINEAR ALGEBRA!???
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Give us formulas and not all this graphing crap. All lecture videos beyond this one are failures. Why? Because the people in the comments have to explain it to each other. Delete these videos, you confuse everyone.
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For any one who is confused with the numbers shown in this video:
When drawn on a graph, the line pointing north to represent the plane should be 4 cm long, and the line facing south east to represent the wind should be 1 cm long because the wind is going 1/4th of the speed that the plane is going, which means the line needs to be one fourth of the length of the planes line. When the head of the winds line is connected with the tail of the planes line, it should be 4.5 cm long, which is equal to 112.5 mph. -
Can someone explain to me how this is substraction? It looks a lot like the other video
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is the pilot´s job to find out the speed and velocity of the wind before the plane can take off
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I have a question how did you subtract the 25mph to 100mph into 80 mph?
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is there any formula for that?
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So you just subtract the number 25 from 100?
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Hi, can u tell what app u were using to write on . And can u tell me the name of that app .
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i just need to know if this is angle affected because i want to build a program with all the physic formulas so far lol i am good at writing C calculator thumbs up bucky, but still i rather write this calculator in python seen that i will need cos,sin,and tan if it is angle affected if not pyt theo and C is the way to write this.
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Couldn't you just use the Pythagorean theorem to get the 3rd line length
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So subtraction and addition are done the same way ?
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It's calculated by either the pilot or the Aircraft Dispatcher, as part of their flight planning. Nothing to do with Air Traffic Control.
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North west or something doesn't really help me Mr.NewBoston
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Can a test be added and will show you which lesson you need to review on missed answers?
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if i actually had this guy for physics, id be doing much better. Too bad i found him a day before my final 🙂
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I didn't see any difference between the subtraction video and addition video. All I saw was that the lines were pointing in different directions…
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at what angle he is drawing lines
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could you make a video showing what kinds of question would you have in a exam paper please
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If you draw properly, you will get a 90 degree triangle and you can measure the length by using Pythagoras theorem.
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are there formulas to work this out so you dont have to draw all this up? it is easy to understand but easyer to rebmber a formula.
Great videos. -
the last line is technicly 103.077….
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I watched ur vids on coding… inspiring! I am goojng to watch all of ur vids im in grade 7
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One quick question, so does it mean the plane is heading straight north in the speed of 80mp/h, or in the direction between north and east in the speed of 80mp/h?
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+thenewboston Can you use Pythagorean Theorem for the Vector Addition/Subtraction when you make the triangle thing?
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"What is going on guys?"
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How many lectures does he have?
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Ans is 75 mph in ne
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This is not vector subtraction. This is vector addition with vectors going different direction. Video is nonsense.
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read a book its much more in depth
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There is law of cosines, but you have to figure out the right angle. In this case you'll be using 45º. Drawing always helps in physics, if you draw them correctly. The correct velocity is 84.199 mph
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So I have to draw this in order to find the result? Isn't there any formula?
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What I love about the person who made these videos is that he really worked hard to teach us.
I'm so thankful. -
Do we really need to draw it to scale.
eg. 100m N do we ned to draw a line 100 meters? -
I got 75mph for the net force
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Don't tell him to make videos for a series on another video series.
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It can also be meausred in tons, like how pressure is measured
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noice. good example now i know vector subtraction and basically how planes calculate and correct for wind
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I am going to pass physics 102 because of this guy! Hahaha
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Thanks for giving your time to help us with physics!
Really great tutorial! -
I'm about to take a HUGE physics test and these lectures really help! Thanks!
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x is the displacement of the two distances, and for this we use the Pythagoras thing where you calculate c^2=√a^2 * b^2
in case anyone wonders how he "guessed" 80
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very good for revision
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ok im in tenth grade- high school. and vector addition/subtraction and even velocity/acceleration is WAAAAY more complicated, so yeah this is very useful, for a "start-up" for younger kids. who probably aren't interested. and some of your videos are more complicating than helping–. however im just revising on them because it's been long since we studied that.
speaking
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thats not how you subtract them
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your a fucking retard, you call yourself a physics teacher. how bout you pass 11th grade calculus before making physics videos
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For more accurate, It should be 84.1989673 mph, 12.11948919 degrees(Whole Circle Bearing)
You are awesome Bucky！！
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