8. When can we say that friction on a floor is greater?
A. If the floor is wet.
B. If the floor is tiled.
C. If the floor is rough.
D. If the floor is smooth.
A. If the floor is wet.
B. If the floor is tiled.
C. If the floor is rough.
D. If the floor is smooth.
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Answer:
C.
Explanation:
You will have to push harder to move the heavier box. This is because gravity pulls down harder on the heavier one, which increases its friction with the floor.