Central Stand Exhibits KL04 Spinning table


Varying the speed of rotation, can you predict where the objects placed on the
spinning table come off?

Place objects one after another to slide onto the spinning table.
You can use the control knob to adjust the speed of rotation.

The objects continue to move in their original direction when they exit the spinning table. They have moved slightly in opposition to the direction that the table is spinning. Some of the objects may remain spinning in the same place.

According to Newton’s first law of motion, an object stays at rest or continues its movement with the same speed and in the same direction unless affected by external forces or if the sum of the external forces is zero. Between the object and the spinning table there is a frictional force whose direction depends on the table’s spinning. When the table spins, the frictional force between the object and the table affects the object’s direction of motion depending on the rotational speed of the table, as well as the object’s initial velocity and moment of inertia. The heavier the object, the greater its moment of inertia, and thus, the less the frictional force from the table will affect the object’s direction of motion. If the initial velocity of the object is great, the frictional force has less time to have any effect on the object.

Frictional forces can be reduced, for example, by smoothing surfaces or using lubricants. Sliding friction can also be changed into rolling friction with the help of ball bearings, whereby the friction coefficient between the materials is reduced.

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