Return to Video

10x-13 Double Inclined Plane

  • 0:00 - 0:03
    This question is about the double inclined plane.
  • 0:03 - 0:07
    What we have here is a pretty intimidating setup.
  • 0:07 - 0:09
    We have what we could view as 2 inclined planes--
  • 0:09 - 0:13
    one inclined at an angle α and one inclined at an angle β.
  • 0:13 - 0:17
    We have two masses--m1 and m2--and of course we're pretending there's no friction,
  • 0:17 - 0:19
    because we just don't want to deal with that right now.
  • 0:19 - 0:24
    I want to know if I set this system up and then release it, how is it going to accelerate.
  • 0:24 - 0:27
    Just to be consistent, let's call clockwise direction,
  • 0:27 - 0:29
    so if this one's moving up then this one's moving down the plane.
  • 0:29 - 0:33
    We'll call that positive acceleration-- +a.
  • 0:33 - 0:40
    For this question I'm going to tell you that the acceleration looks something like this.
  • 0:40 - 0:42
    Now, what's going on here?
  • 0:42 - 0:44
    Well, the acceleration is g--the acceleration due to gravity--
  • 0:44 - 0:47
    times this modifier of some sort.
  • 0:47 - 0:50
    What I want you to do is in each of the red boxes
  • 0:50 - 0:55
    put either a 1 or a 2 if the relevant mass is mass 1 you put a 1, 2 you put a 2.
  • 0:55 - 1:00
    In the blue boxes, I want you to put either a plus, a minus, multiplication sign,
  • 1:00 - 1:04
    or division sign, depending on what you think makes sense.
  • 1:04 - 1:06
    Now, you could just solve this equation.
  • 1:06 - 1:09
    You could do F = ma for both of the blocks and get an answer.
  • 1:09 - 1:11
    Or you could try using your intuition.
  • 1:11 - 1:13
    See what makes sense. Think of limiting cases.
  • 1:13 - 1:17
    What happens when m1 gets really big or m2 gets really big.
  • 1:17 - 1:20
    What happens if β is really small or α is really small?
  • 1:20 - 1:25
    Thinking this way should be able, in theory, to tell you exactly
  • 1:25 -
    what symbols go in the blue and red boxes. Good luck.
Cím:
10x-13 Double Inclined Plane
Video Language:
English
Team:
Udacity
Projekt:
PH100 - Intro to Physics
Duration:
01:30
Amara Bot hozzáadott egy fordítást

English subtitles

Felülvizsgálatok