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the effect that height has on the diameter of a crater bbc
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Investigating the Size of Craters in Sand when a Marble is Dropped into the Sand from Different Heights
* Metal container
* Sand
* Marble
* 1 metre rulers
* 30cm ruler
Method
* First of all I collected all the equipment I needed.
* Next I put the tub of sand next to the wall and leaned the ruler
up against the wall resting on the sand.
* I then took the marble and dropped it into the sand from different
heights.
* After each drop I took my 15cm ruler, measured the diameter of
each crater and then smoothed the surfaced the surface of the sand
out.
* I then recorded my results and from the diameter I worked out the
area of each crater.
* I repeated this experiment three times.
Variables
* Height dropped
* Size of marble
* Type of sand
* Amount of sand
The variables that I will keep the same are the size of the marble,
the type of sand and the amount of sand. The variable I will change is
the height at which the marble is dropped. I believe that this will
give me the best results.
Prediction
I believe that the greater the height from which the marble is dropped
the greater the area of the crater in the sand will be. I also believe
that at a certain height and above the crater in the sand will stay
the same.
Theory behind Prediction
When an object is falling it builds up more and more speed due to
acceleration. The more speed it builds up the more force it builds up.
When the object hits a surface the force is used up on the surface.
The higher the height from which a marble is dropped the bigger ...
... middle of paper ...
... sand the more sand it is able to push away therefore making a bigger
crater. My other prediction saying ‘after a certain height from which
the marble was being dropped the area of the crater would stay the
same’ was correct because when a free-falling object first sets off it
has much more force accelerating it than resistance slowing it down.
As the speed increases the resistance builds up. This gradually
reduces the acceleration until eventually the resistance force is
equal to the accelerating force and then it won’t be able to
accelerate anymore. This means it will have reached its terminal
velocity and wont go any faster. This means that the crater will stay
the same from a certain height and above.
BIBLIOGRAPHY
The Science Coordination Group – Revision Guide for GCSE Double
Science, Physics Higher Level.
[8.3] In what ways do you think your results would have been different if you had sampled at a different height on the rock?
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