![](https://pinterest.com/pin/create/button/?url=http://www.dartofscience.com/video/viscosity-race/&media=http://www.dartofscience.com/wp-content/uploads/2016/07/viscosity-race.jpg&description=<a href="http://www.dartofscience.com/wp-content/uploads/2016/07/vlcsnap-2016-05-20-16h18m19s041.png"><img class="alignleft wp-image-729" src="http://www.dartofscience.com/wp-content/uploads/2016/07/vlcsnap-2016-05-20-16h18m19s041-300x169.png" alt="vlcsnap-2016-05-20-16h18m19s041" width="193" height="109" /></a>What happens when a drop of liquid rolls on a surface? Rolling involves friction - a force that opposes motion due to the molecular forces of attraction between the points of contact between a body and the surface. For fluids, this friction manifests itself as viscosity - a term that can be loosely understood as the 'thickness' of the fluid. Viscosity is the measure of the resistance to deformation due to shear or tensile stress, of a fluid. Viscosity is dependent on the density of the fluid.<a href="http://www.dartofscience.com/wp-content/uploads/2016/07/vlcsnap-2016-05-20-16h17m59s337.png"><img class=" wp-image-728 alignright" src="http://www.dartofscience.com/wp-content/uploads/2016/07/vlcsnap-2016-05-20-16h17m59s337-300x169.png" alt="vlcsnap-2016-05-20-16h17m59s337" width="229" height="129" /></a> Therefore, the higher the viscosity, the slower it will roll, and the heavier it will be. When our composite ball is placed on the inclined plane, a component of the combined weight of the body pulls it down the surface. The forces opposing this motion are - the friction between the inclined surface and the ball, and the viscous forces inside the dishwashing soap that resist the motion of the heavy metal bearing. The viscous force resists the deformation of the liquid due to the external force of gravity. This is why the composite ball seems to defy gravity.)
![](https://www.linkedin.com/shareArticle?mini=true&url=http://www.dartofscience.com/video/viscosity-race/&title=VISCOSITY RACE&summary=<a href="http://www.dartofscience.com/wp-content/uploads/2016/07/vlcsnap-2016-05-20-16h18m19s041.png"><img class="alignleft wp-image-729" src="http://www.dartofscience.com/wp-content/uploads/2016/07/vlcsnap-2016-05-20-16h18m19s041-300x169.png" alt="vlcsnap-2016-05-20-16h18m19s041" width="193" height="109" /></a>What happens when a drop of liquid rolls on a surface? Rolling involves friction - a force that opposes motion due to the molecular forces of attraction between the points of contact between a body and the surface. For fluids, this friction manifests itself as viscosity - a term that can be loosely understood as the 'thickness' of the fluid. Viscosity is the measure of the resistance to deformation due to shear or tensile stress, of a fluid. Viscosity is dependent on the density of the fluid.<a href="http://www.dartofscience.com/wp-content/uploads/2016/07/vlcsnap-2016-05-20-16h17m59s337.png"><img class=" wp-image-728 alignright" src="http://www.dartofscience.com/wp-content/uploads/2016/07/vlcsnap-2016-05-20-16h17m59s337-300x169.png" alt="vlcsnap-2016-05-20-16h17m59s337" width="229" height="129" /></a> Therefore, the higher the viscosity, the slower it will roll, and the heavier it will be. When our composite ball is placed on the inclined plane, a component of the combined weight of the body pulls it down the surface. The forces opposing this motion are - the friction between the inclined surface and the ball, and the viscous forces inside the dishwashing soap that resist the motion of the heavy metal bearing. The viscous force resists the deformation of the liquid due to the external force of gravity. This is why the composite ball seems to defy gravity.&source=http://www.dartofscience.com)
NOTICE BOARD
d’Art of Science partners with DFC 2017
Starting this year, d’Art of Science partners with DFC for promoting Hands-on/DIY Culture in Schools by starting a sub-award in the annual DFC Challenge. One school selected under the Best Prototype Award will get a chance to travel to Goa and develop their solution prototype in Goa with us. Over… READ MORE…
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