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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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