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In each of the following situations state what effect the change will have on friction using the following choices:
A. Increase
B. Decrease
C. No change
___1. The normal force increase.
___2. The speed of the object changes from 10 m/s to 20 m/s.
___3. The speed of the object changes from 0 m/s to 20 m/s
___4. The roughness of only one surface is increased.
___5. The surface area in contact increases.
___6. A lubricant is added between the surface.
___7. Ur changes to uk
___8. Two pieces of rubbing metal are moved from earth to outer space.
___9. Applying floor wax in a classroom.
___10. Gymnasts apply more coarse substance on their hands.
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