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					       FALLING


Welcome to Sutton Coldfield
 Grammar School for Girls
FALLING…


…and GRAVITY
 Now are you sure         Yeah..
 you want to video
   conference?
                          Yeah I know..

 You said last time it
     was dull…
                            Yeah…Forces &
                                stuff…
..and you know what
    it’s all about?




  OK then, let’s go and
                          I wanna’ watch
  listen to Mr Hughes
                            MONSTER
                             TRUCKS
 MINI EXPERIMENT
We are going to drop several sheets
 of paper of the same mass & time
              their fall.
  The variable we will change is:
 SURFACE AREA OF THE PAPER
       RESULTS:
Size of    Surface     Time to
paper     area (cm2)   fall (s)
  A4         616

  A5         308

  A6         154

  A7         77
    CONCLUSIONS:
• Objects of the same mass fall at
different speeds if their surface areas
are different.
• The larger the surface area, the
greater the drag (air resistance) and
the slower an object falls.
    THEORY:
    DRAG
(air resistance)




   WEIGHT
   (due to
  GRAVITY)
     WHAT HAPPENS
     WHEN WE FALL?
• GRAVITY (downwards) makes us
accelerate (speed up).
• DRAG (upwards) starts to increase.
• Eventually, DRAG = WEIGHT, so the
resultant force is zero.
• If there is no force, speed cannot change –
we reach TERMINAL VELOCITY.
    SPEED-TIME graphs:
    SPEED         MOON

                         EARTH




0
                    TIME
 WHO IS
CORRECT?

  A        A   B

                   C
 WHO IS
CORRECT?

  C
           A   B   C
 WHO IS
CORRECT?       B
           A           C



  D
                   D
 VICKY’S NOTEBOOK


                        Yeah, whatever..




Read Vicky’s Physics notes on
FORCES. Can you rewrite them
  so that they make sense?
(1) What is TERMINAL VELOCITY?
VICKY SAYS…

Yeah, but no, but yeah, but we was talking
about speed right, and that Lizette Ball said
it was going so fast that it will kill you and I
was like ‘that is well bad, you muppet, innit,
we all knows that it is how fast you goes
when there ain’t no drag on you’ and she
was like ‘whatever!’ and I said ‘Yeah and it
is measured in metres an hour’, like she
didn’t know ‘cos she is thick and couldn’t
even get a job at that cheap burger place
down the road next to the Oxfam shop…
(1) What is TERMINAL VELOCITY?
VICKY SHOULD HAVE SAID…

Terminal velocity is the maximum speed 
reached when objects fall on Earth , at
the point where DRAG = WEIGHT .

  That is well bad,
  yeah, saying I is
       thick..
CELEBRITY GOSSIP!


  Whatever these celebs
    are talking about,
    it isn’t correct…
                         DRAG?
             It’s a drag listening to you lot
(1)           all day…Drag is exactly the
              same thing as friction, and it
                 always acts in the same
             direction you go in…now stop
                    wasting my time!




      Simon discusses DRAG…
(2)             When you drop
                somefink it falls
               quicker if it is biga,
               yeah, because its
                size is bigger…




      discussing FALLING…
(3)
        Well, Victoria, I   David, what is
         fink it is what      Terminal
      happens when you
           open your
                            velocity then,
        parachute and        sweetheart?
           move back
            upwards




 Posh & Becks
   discuss
  TERMINAL
 VELOCITY…
  THANK YOU!



  GREG HUGHES:
ghu@suttcold.bham.sch.uk

				
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posted:8/8/2012
language:English
pages:21