Investigation to find out what affects the size of a shadow.
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Liam Haggerty 11Wd Investigation to find out what affects the size of a shadow. Aim To see what happens to the size of the shadow when certain factors are changed. Variables There are many variables in which I could change. For our experiment it will be sufficient for us only to change one variable the rest we will keep constant. Here is a list of variable from this I will choose on variable to which I think will have the mast effect on the size of the shadow. * Positioning of screen in co-ordination with the lamp * Size of the screen and the lamp * Size of the object used. * Shape of the object used * Angle of the screen * Shape of the screen * Distance between light and object. The variable highlighted in red is the one I will change, as this I believe is the factor that affects the size of a shadow the most. Hypothesis I predict that the closer the object is to the light source the larger the shadow will be.
If we used a slightly different sized object are graph wouldn't be true. * I will measure our results very accurately in some cases three decimal places to ensure our results are very reliable. * The height of the lamp must remain the same throughout the experiment this is to ensure that we have no anomalies or unjustified results. If we follow all these guidelines our experiment should turn out reliable as well as successful. Plan * Attach boss to clamp stand. * Connect light source to power pack using connecting wires provided. * Securely fix the lamp to the boss at 50-cm (use a 100cm ruler to measure accurately). * Place down sheet of white a4 paper to act as screen again checking the height of the bulb. * Position object at 5cm intervals from the screen (e.g. 5cm, 10cm, 15cm etc) * Mark on the screen the size of the shadow accurately with a sharp pencil. * Tabulate results in an appropriate table making them clear and easy to understand. Results Experiment 1 Height from screen (cm)
Evaluation After doing our experiment I can safely say that our results were sufficient enough to support a firm conclusion. This is due to the fact we repeated the experiment three times and all the results roughly matched up with each other. This was made possible because we carried our experiment out under fair guidelines and made sue everything was checked and recorded accurately. From looking at my graph it is safe to say that there weren't any anomalies as most of the points touch or are very close to my line of best fit. Although our results were sufficient enough I still believe that the experiment could of taken place under stricter guidelines and in more detail. If I did the experiment again I would make a few alterations to make our results even more reliable. Firstly I would change the light source to a ore secure and reliable one making sure the light had no chance falling or cutting off. This way we could concentrate on the object and the shadows more instead of adjusting the light. I would also make sure we had a device to hold the object in place. This would guarantee the objects were at the same angle and the correct distance from the screen.
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