Three groups of students are going to carry out an investigation of objects fall
ID: 1338788 • Letter: T
Question
Three groups of students are going to carry out an investigation of objects falling through
various liquids. Given below are descriptions of each investigation.
Group 1 uses stop watches to time equal mass objects of various shapes as they
fall through tall cylinders of five different liquids. Members of the group take
turns dropping the objects into the liquids while other members of the group
start and stop the watch. The cylinders they use are 60 cm tall.
Group 2 uses a set of coupled photo-gates to time how long the same spherical
ball takes to fall in the five different liquids. The same member of the group
drops the ball each time and the cylinders they use are 2 m tall.
Group 3 uses stop watches to time how long the same spherical metal ball
falls in the five different liquids. The same member of the group drops the
ball each time and one of the other members always does the timing. The
cylinders they use are 1 m tall.
How would the uncertainties for these three groups compare and why?
How readily do you think these groups could detect a small difference in the behavior of two of the five liquids and why?
Note: What I do not understand is how to go about answering these types of questions. We have not discussed anything of this nature in class, and I am not sure if we need to use some sort of calculations, expressions, etc. Any help/feedback would be greatly appreciated.
Explanation / Answer
1. The uncertainity in the results of group 2 is alwauys less than in comparision to the group 1 and group 3 because they uses photogates which are greatly sensitve as compared to a stop watch handeled by a human being. on the other hand as comapre to the lenght of the cylinder used by the groups the uncertainities will be in the order as follows
group2 < group 3<group1
2. these group can detect the difference any small difference in the behaviour of falling balls in given five liquides because the terminal velocity of any falling object in a liquid depends on its viscosity and length of the cylinder.
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