KEY STAGE 3 SCIENCE _ SPEEDING UP _9K_ by malj

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									KS 3 SCIENCE : SPEEDING UP (9K)                          SPEED EXPERIMENT 2
AIM :
To investigate how the surface area of a falling object affects its speed.

EQUIPMENT :
  Aluminium foil
  Scissors
  Stopwatch
  Tape measure
  Sellotape

METHOD :
  1. Use a template to cut 5 circles (of the same size) out of a sheet of aluminium
     foil.
  2. Cut carefully from the edge to the centre of each circle.
  3. Gently fold each into a conical shape, each one with a different size base.
  4. Measure and mark a point 2m above the floor.
  5. Record how long it takes for each cone to fall through this distance.
  6. Ensure the cone is positioned with its tip 2m from the ground.
  7. Repeat the experiment and calculate the average time.
  8. Use s = d/t to calculate and then record the average speed of each cone.
  9. Enter all results in the table on the next page.

DIAGRAM :

 1. Cut 5 circles                                          2. Fold into a
 out of aluminium                                          conical shape, and
 foil, and cut each                                        use a very small
 one as shown by                                           piece of sellotape
 the dotted line.                                          to secure the shape.



  3. Make 5 cones
  with different
  size bases.


  4. Record the time to fall 2m
                                  As an extension of this exercise, measure the
                                    diameter of each cone carefully, and record it in
                                    centimetres in your table of results. This will
     2m                             allow you to produce a line graph, with a line of
                                    best fit, instead of a bar chart!




  RESULTS :

  The distance moved by each cone (d) = ______ m

                    TIME (s)                                             AVERAGE

 Size of cone           T1                T2         Average Time     SPEED* (m/s)




  * Use average speed = d / average time

GRAPH :
  Draw a bar chart (or line graph) of average speed against size of cone.
    Remember your dependent variable must go on the vertical axis, and the
    independent variable must go on the horizontal axis.

CONCLUSION :
  1. What pattern is shown by your results?
  2. Try to explain your findings with scientific facts.

								
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