Practical investigation into Viscosity in liquids(Stokes Law)

... 1.38 1.397 Medium 0.29 1.28 1.28 0.950 Large 1.27 1.30 1.29 1.287 Very large 1.64 1.62 1.63 1.630 Extra large 3.60 3.55 3.59 3.580

On investigation this experiment was not valid as it changed the parameters of the original investigation i.e. the liquid was forced under pressure between the ball bearing and tube.

Experiment 2

The second experiment had all the variables the same apart from the viscosity of the liquid that was changed. The liquid used for this experiment was engine oil.

Although it is easier to measure the rate of descent through engine oil because it is slower, the measured interval remained at 20cm.

The results are as follows:

Very small Distance Timed (cm) Time taken(s) for ball bearing to pass through distance measured 1 2 3 Average 0-20 1.89 1.86 1.88 1.877 10-30. 1.83 1.77 1.80 1.800 20-40 1.76 1.75 1.78 1.763 30-50 1.76 1.79 1.77 1.773 40-60 1.77 1.78 1.77 1.773

Small Distance Timed (cm) Time taken(s) for ball bearing to pass through distance measured 1 2 3 Average 0-20 0.86 0.84 0.85 0.850 10-30. 0.69 0.67 0.68 0.680 20-40 0.62 0.62 0.62 0.620 30-50 0.62 0.60 0.61 0.610 40-60 0.61 0.62 0.61 0.613

Medium Distance Timed (cm) Time taken(s) for ball bearing to pass through distance measured 1 2 3 Average 0-20 0.45 0.49 0.46 0.467 10-30. 0.38 0.37 0.39 0.380 20-40 0.39 0.36 0.38 0.377 30-50 0.39 0.38 0.36 0.377 40-60 0.37 0.38 0.37 0.373

Large Distance Timed (cm) Time taken(s) for ball bearing to pass through distance measured 1 2 3 Average 0-20 0.92 0.90 0.91 0.910 10- ...