Why? The weight of the buckets holds them against the table/the table against them.
Basically, you have three forces acting on the buckets:
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Gravity, in proportion to the weight of the buckets, pulling them down.
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Tension from the rope, in proportion to the weight of the table, pulling them up.
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Normal force, or the fact that two solid objects can’t pass through each other.
And three forces acting on the table:
-
Gravity, in proportion to the weight of the table, pulling it down.
-
Tension from the rope, in proportion to the weight of the buckets, pulling it up.
-
Normal force, or the fact that two solid objects can’t pass through each other.