velocity relative to the object, - is the drag coefficient a dimensionless coefficient related to the – object's geometry and taking into account both skin friction and form drag, - is the reference area). Graph 10. Graph 11. So I would assume my Graph 8. and Graph 9. are accurately showing the dependence of friction force versus velocity. Conclusion and Evaluation Calculations made in analysis and theory seem to prove accuracy of my graphs showing the dependency of friction force versus velocity. As ball is falling its acceleration is decreasing leaving velocity increasing in a slower rate but the friction force is dependant from the velocity squared which means that as velocities rate of change slows down friction force is still increasing more by square (). This leads to that strange tail curve upwards at the end of the graph also the middle of the graph show a relation of a quadratic function expected from the formula of drag in fluids. The terminal velocity reached and relationship of friction force versus time is plausible which lets me assume that the experiment conducted was successful. Although at first it I expected great inaccuracies because experiment had a lot dependencies from my dropping and many transformations of graph could have led to errors in calculations the conclusion is plausible. Now it would be interesting to do the same experiment with other variables like shape or size or material of the ball. The most interesting change would be try it in more than one medium. Something like food oils, or honey also maybe try to increase density of water with trying to dissolve some salts in it or other kinds of mean changing the density of the medium and getting the graph from those and then comparing them could lead to interesting results.
velocity relative to the object, - is the drag coefficient – a dimensionless coefficient related to the object's geometry and taking into account both skin friction and form drag, - is the reference area). Graph 10. Graph 11. So I would assume my Graph 8. and Graph 9. are accurately showing the dependence of friction force versus velocity. Conclusion and Evaluation Calculations made in analysis and theory seem to prove accuracy of my graphs showing the dependency of friction force versus velocity. As ball is falling its acceleration is decreasing leaving velocity increasing in a slower rate but the friction force is dependant from the velocity squared which means that as velocities rate of change slows down friction force is still increasing more by square (). This leads to that strange tail curve upwards at the end of the graph also the middle of the graph show a relation of a quadratic function expected from the formula of drag in fluids. The terminal velocity reached and relationship of friction force versus time is plausible which lets me assume that the experiment conducted was successful. Although at first it I expected great inaccuracies because experiment had a lot dependencies from my dropping and many transformations of graph could have led to errors in calculations the conclusion is plausible. Now it would be interesting to do the same experiment with other variables like shape or size or material of the ball. The most interesting change would be try it in more than one medium. Something like food oils, or honey also maybe try to increase density of water with trying to dissolve some salts in it or other kinds of mean changing the density of the medium and getting the graph from those and then comparing them could lead to interesting results.