Length: 578 words (1.7 double-spaced pages)
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Aim: To investigate how changing a feature, like using length affects
the speed of the spinner.
Plan: In this investigation in testing how fast a spinner's speed is I
am going to make the variable the wing length. I made a prototype
spinner to observe what different types of material made a better
spinner; matters that will affect the spinner are the weight of the
spinner, friction, up-thrust and the gravitational pull. The bigger
the surface area of the spinner the more friction there will be.
In the experiment I will change the wing length 10 times and cut 1 cm
off each time. I will repeat this 5 times to be certain I have
recorded the right time.
To make this a fair test I have to use the same type of paper to make
my spinner, in this case I am using graph paper. I have to keep the
same amount of paper clips attached to the spinner, I also have to
keep the height that I drop the spinner from (2.5 metres), and I also
want to use the same stopwatch so it gives off the right time and at
the right speed because other stopwatches may vary.
I predict that the shorter the wing length gets the faster the spinner
is going to fall and reach the ground. I think this because the
shorter the wing length the less surface area there is on the spinner
and less friction and up-thrust. I am going to use a results table to
record my data.
The safety aspects of the investigation I have to consider are:
· Make sure no-one is stood around you,
· Make sure stool is safe to stand on,
· Careful using scissors.
These were my results:
Starts spinning when dropped
Half way before starts spinning
Nearly at the ground before spinning
Analysing evidence: My results show that my prediction was right, the
shorter the wing length the faster the spinner falls.
The bar chart also shows the shorter the wing length gets the faster
the spinner falls, as shown as positive strong correlation. There are
no outliers in my graph which I am pleased about, this means there was
no human error in my investigation and it was a relatively fair test.
With the forces acting on the spinner if the spinner did not have
attached a paper clip the speed would be a lot less and it would have
taken longer for the spinner to reach the ground, though the more
weight and speed the spinner has the more the friction is against it.
When the wings got shorter the spinner sped up this is because with
the less surface area this is less friction and less force against the
wings to keep it up in the air.
Evaluation: In my opinion the methods used were reliable and easy to
analyse and complete, the results I obtained are of a good standard
because I achieved my aim and there weren't any outliers. In my
investigation there were no problems that I came across. The method
though was suitable and easy to use but could be improved by using
better materials. I think there is enough evidence to support my
conclusion and my data is very reliable since there were no outliers
and no wrong information and speeds given. I think my investigation
was extremely successful and if I was to do this investigation again I
would punch holes into the wings and see if that would change the
speed and mean will change because I think that would affect the
spinner's flight due to air resistance.