Scene 1
Interaction: Users select among various size (volume) spheres that are all made of the same material (thus the same density). Idea: Density is an intensive property of matter and a change is size alone does not change the object’s density or ability to sink or float (buoyancy). Scene 2 Interaction: Users make selections on two dimensions, size (volume) & material (mass). The densities of the three materials vary as depicted by the varying shades (light=low density; dark=high density). Idea: One must consider both the size (volume) of an object & the mass of an object to determine if it will sink or float. The density of an object is the ratio of its mass to volume. Scene 3 Interaction: Users can change the object on two dimensions, material (mass) & its shape. The densities of the three materials vary as depicted by the varying shades (light=low density; dark=high density). Idea: The shape of the object does impact its ability to float. If an object displaces a volume of water that has a mass that is greater than the mass of the object itself then it will float. Archimedes’ principle states that any object completely or partially submerged in a fluid at rest is acted upon by an upward, or buoyant, force the magnitude of which is equal to the weight of the fluid displaced by the body. If the buoyant force is greater than the gravitational force, the object floats. [Note: I think we need a shape that allows a “sinker” to float...still pushing for a “boat shape...] Scene 4 Interaction: Users can vary both the density of the object & the density of the liquid it is placed in. The densities of both object & liquid are depicted with varying shades (light=low density; dark=high density). Idea: One must also consider the density of the liquid in relation to the density of the object to determine if it will sink or float. If the density of the liquid increases than the volume of the displaced volume has to be smaller in order to give the same buoyancy force. Scene 5 Interaction: Users can vary both the density of the liquid & the amount (volume) of the liquid that the object is placed in. Idea: The amount (volume) of the liquid does not impact an object’s sinking or floating. Sinkers sink & floaters float regardless of how liquid it is placed in. Scene 6 Sandbox where users can interact with all of the dimensions presented in the previous scenes. Added 7.26 Meniscus added to highlight water displacement. Displaced water in the container is shown in a different color to highlight water displacement. Different container shape options are available to highlight that the shape of the container does not impact whether an object floats or sinks. Visualizations of the displaced liquid and the submerged object are shown on a balance scale (upper right corner). The object (left side of scale), displaced liquid (right side of scale), and their force arrows change in size and appearance according to the settings selected through the option menu. The scale tilts to either side, or remains balanced, depending on the weight of the object and displaced liquid. Users have the ability to “feel” the weight of the object or displaced liquid by picking them up off the scale. “Ghost” versions of the grabbed object remain on the scale to make it clear that the grabbed object’s weight is still being compared to the other object.
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