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Students can make observation and/or measurements of the Rattleback's motion to provide evidence that a pattern can be used to predict future motion.
Students can make observation and/or measurements of the Rattleback's motion in an investigation plan to provide evidence that the change in an object's motion depends on the sum of the forces on the object and mass of the object.
Students can make observation and/or measurements of the Rattleback's motion and then use mathematical representations to support the claim that the total momentum of a system of objects is conserved when there is no net force on the systems.
Place your Rattleback, curved side down, on a firm surface, like a tabletop, and spin it counterclockwise. It should spin freely. Now try to spin it clockwise. Notice that it begins to wobble and slow then reverses direction.
The Rattleback is shaped much like a canoe, but its keel is not parallel with the rest of the boat. This causes the center of gravity to shift right or left depending on which end of the 'keel' is in contact with the surface it sits on. Try simply setting your Rattleback on a table. Without trying to spin it, press down and release one end. As it rocks, it will begin to spin. Variations: Try your Rattleback on different surfaces. Try attaching small weights or coins to each end.
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