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1.1 Have you   wondered , when you drink your juice with straw,  which force pushes the juice and rises it up to your mouth?

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1.1 Have you   wondered , when you drink your juice with straw,  which force pushes the juice and rises it up to your mouth?

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1.2  You drink your juice that is contained in a paper box. When you drink your juice or pull air from the box you observe that the box is creased . Can you give an explanation for that? Which force  is  responsible for the crushed box and why?

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1.2  You drink your juice that is contained in a paper box. When you drink your juice or pull air from the box you observe that the box is creased . Can you give an explanation for that? Which force  is  responsible for the crushed box and why?

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1.3 In the moon, where  does  not exist air, the astronauts could drink juice with a straw?

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1.3 In the moon, where  does  not exist air, the astronauts could drink juice with a straw?

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1.4  All of us have used a sucker that sticks at the wall in order to hang objects,  e.g.towels. If we stick a sucker in the pane or in certain other smooth surface and we attempt to whip it, we will face great difficulties. What is happening and the sucker  “does stick” at the wall?

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1.4  All of us have used a sucker that sticks at the wall in order to hang objects,  e.g.towels. If we stick a sucker in the pane or in certain other smooth surface and we attempt to whip it, we will face great difficulties. What is happening and the sucker  “does stick” at the wall?

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ΦΥΣΙΚΗ Β ΓΥΜΝΑΣΙΟΥ(160)