Heather rolls a marble over sand paper and then over a flat table. Which statement best describes the observations she made?
When the marble is pulled, the friction on the table is greater.
When the marble is pushed, the friction is greater on the sandpaper.
The amount of friction is about the same on both surfaces.
The force of gravity pulling the marble lessens the friction between the surfaces.
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Heather rolls a marble over sand paper and then over a flat table. Which statement best describes th...
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