Why it is difficult to pull a suction cup from a glass surface
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Explanation:
Rinse the entire suction cup under warm, almost hot, tap water. This helps soften the cup, which makes it more pliable. Shake off excess water, then press the cup onto the desired surface. Water droplets on the inside of the cup help prevent air pockets that could cause suction-cup failure.
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Answer:
Simply because a smooth surface makes a better seal. The way a suction cup works is that it pushes all the air out as you force it
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