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Hey everyone, I am so confused with this it's not funny. This is my first time accessing a site like thisss, but I am desperate seeing as though it's school holidays atm where I am and I can't talk to my physics teacher for help. Anyhow, I hope one of you guys can help me out. :smile: Ok I have 2 problems. One is with adding and subtracting vectors. Ok when I have to vectors to add or subtract say 12ms-1 west + 14 ms-1 north < IMG SRC="http://members.optushome.com.au/rossverg2002/1.JPG"> Before I do anything I draw my diagram as descbried above. The problem is that in oder to add them I need to have the vectors touching arrow-to-tail. The problem is which one of the arrows do I reverse and how do I express the new velocity (with a - sign?). Does it even matter which arrow (velocity and direction) I reverse? Ok second problem :frown: ... I am confused with relative velocity. In my textbook there is a formula: Velocity of a relative to b = velocity of a - velocity of b. How do I know when to use the formula or vector diagrams? Is it only meant for velocities in a straight line? What do I do when there are 2 dimensional velcoities (like a velocity north relative to a velocity east); do I use vectr diagrams instead of teh fomrula?? Thankyou to all who help. Your help is greatly appreciated. o:) |
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