Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Started Gr.12 physics

  1. Sep 14, 2005 #1


    User Avatar

    I just started Gr.12 physics and im sort of lost. Does anyone know a site where i can learn perfectly how to draw tangents of curves to determine instantaneous velocity or acceleration or even speed. I really need to learn this stuff.
  2. jcsd
  3. Sep 14, 2005 #2

    Doc Al

    User Avatar

    Staff: Mentor

  4. Sep 14, 2005 #3


    User Avatar
    Science Advisor

    Drawing tangents to curves? Here' a method I learned in high school- take a small pocket mirror and line it up approximately perpendicular to the curve. Turn it slightly until the reflection of the curve in the mirror appears to smoothly continue it. Now the mirror really is accurately perpendicular to the curve at that point. Now you can turn and use the mirror in the same way to draw a perpendicular to that new line at the same point. This second line will be tangent to the curve.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook