Trolley Investigation
Choosing a Variable
Before I begin the investigation, I must first decide which variable I
should investigate.
Variables can be divided into 2 major groups: dependant variables and
independent variables. In measuring the behaviour of a trolley the
dependant variable is speed. This is because the speed will change
when other variables are changed.
An independent variable is a variable which cannot be affected by
other variables. There are many independent variables in measuring the
behaviour of a trolley and I must first assess which one would be a
suitable one to investigate:
* Shape of the trolley- the shape and aerodynamics of the trolley
can affect its motion behaviour. This is because the trolley is
affected by air resistance and certain shapes are more air
resistant than others. This would be a difficult variable to
investigate because we would be limited by the number of shapes we
could use. It would be difficult to plot the results in the form
of a line graph.
* Gradient of ramp- gradient of the ramp affects the motion of the
trolley because as the gradient gets larger the height the trolley
starts from gets higher as well. This would mean that at higher
points the trolley would have more gravitational potential energy.
This would be a good variable to investigate because we can use
various gradients but it might be slightly difficult to measure
some angles with the protractor.
* Height of start position- this affects the motion of the trolley
because as the height gets larger the trolley gains more
gravitational energy. This would be a good variable to investigate
because there are many heights we can use and it is also easy to
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slope. I think that out of all the variables, this is the one which is
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