A suction pad of area 0.0020 m² is pressed onto a smooth wall so that all the air behind it is squeezed out. Atmospheric pressure is 100 000 Pa. What force holds the pad against the wall?

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Question

A suction pad of area 0.0020 m² is pressed onto a smooth wall so that all the air behind it is squeezed out. Atmospheric pressure is 100 000 Pa. What force holds the pad against the wall?

Accepted Answer

200 N — Award 1 mark. Force = pressure × area gives 100 000 Pa × 0.0020 m². With no air behind the pad there is nothing pushing back, so the whole of this force presses it to the wall.

Answer

500 N

Answer

50 000 N

Answer

0.020 N

Answer

200 N

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