Question

What force is needed to pull one microscope slide over another at a speed of 1:00 cm/s, if there is a 0.500 my think layer of 20.0 water between them and the contact area is 8:00 cm²?

Answer 1

The force required to glide one slide over the other is

$F=\eta\frac{v}{l}A .$

$F-F_f=ma=0\to F=F_f$

$\eta=0.001002\ (t=20°)$