Drop shape’s influence on the maximum impact radius and maximum impact force

Using ferrofluid, we realize various drop shapes and illustrate its fundamental role in drop impact on a solid surface. We study the influence of drop’s aspect ratio and discover that both the maximum spreading radius and the maximum impact force systematically depend on the aspect ratio. We explain the maximum radius with the viscous dissipation model and the maximum force with the high-stress cylinder model, which agree with the experiment nicely.