Here are the videos from the “Definition of a fluid – sliding OHP transparencies” demonstration. the full videos are linked from the GIF titles

Shearing a solid (book) showing finite deformation

Shearing a fluid showing continuous deformation

An index of all the demonstrations posted on this blog can be found here. Don’t forget to follow @nbkaye on twitter for updates to this blog. If you have a demonstration that you use in class that you would like to share on this blog please email me (nbkaye@clemson.edu). I also welcome comments (through the comments section or via email) on improving the demonstrations.

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Probably we can improve this demonstration by shearing the solid (book) and the fluid (soap water, honey) with a constant force, which may be done by hanging weights.

The point of focus of this demo is to show that fluids will deform “continuously” under shear whereas a solid will stop deforming at some point of time. A smart student can ask if a jello is a fluid or not, because it will keep deforming if you apply more and more shear force (of course not forever; it will break at some point). But if one keeps the shear force constant, it will cease to deform at some point. Therefore, I think if the force can be kept constant and not applied by hands so that students know that it is constant (like by hanging weights to one of the surfaces), it may be better.

Thanks for the nice demo!