Air Pressure Experiment Worksheet

Science experiments lesson 6: Air pressure: the card on a glass · Set 32 · 40 questions

What you do (Air pushes): 1. Fill a plastic glass right to the top with water. 2. Lay the postcard flat on top, covering the rim. 3. Over a sink or bucket, hold the card and turn the glass upside down. 4. Slowly take your hand away from the card and watch.

1. 1.🧺 Do we need a mirror for the card-on-a-glass trick? (a) not needed (b) needed
2. 2.🥛 Why is it best to fill the glass right to the top? (a) the card gets wet (b) water is heavier (c) it looks nicer (d) little air left inside
3. 3.🧺 Three of these are needed for the card-on-a-glass trick. Which one is NOT needed? (a) a towel (b) a balloon (c) a glass of water (d) a sink or a bucket
4. 4.🧺 Do we need a sink or a bucket for the card-on-a-glass trick? (a) not needed (b) needed
5. 5.🧺 Do we need a stiff postcard for the card-on-a-glass trick? (a) needed (b) not needed
6. 6.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? Which of these is kept the same? (a) how full the glass is (b) the same card (c) whether the card stays
7. 7.🥛 Does a compass needle work by air pressure or by magnetism? (a) magnetism (b) air pressure
8. 8.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? True or false: whether the card stays is what we measure. (a) True (b) False
9. 9.🧺 Which of these is not needed for the card-on-a-glass trick? (a) a towel (b) a stiff postcard (c) a balloon (d) a glass of water
10. 10.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? Which of these is kept the same? (a) whether the card stays (b) how full the glass is (c) the way we turn it
11. 11.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? True or false: how full the glass is is what we measure. (a) False (b) True
12. 12.True or false: a stiff postcard is not needed for the card-on-a-glass trick. (a) True (b) False
13. 13.🔍 You turn the full glass upside down, holding the card, then let go of the card. What happens? (a) the card flies away (b) the glass breaks (c) the card stays on (d) the water turns to ice
14. 14.True or false: a glass of water is needed for the card-on-a-glass trick. (a) False (b) True
15. 15.True or false: a medicine dropper works by air pressure. (a) True (b) False
16. 16.🧺 Three of these are needed for the card-on-a-glass trick. Which one is NOT needed? (a) a stiff postcard (b) a sink or a bucket (c) a towel (d) a magnet
17. 17.🔍 Which is the odd one out? (a) a suction hook (b) a fridge magnet (c) a vacuum cleaner (d) a bicycle pump
18. 18.🛟 Why is a plastic cup safer than a glass for small children here? (a) it is hotter (b) it is heavier (c) it will not break (d) it is magnetic
19. 19.🔮 Predict: you squeeze an empty plastic bottle with its cap screwed on tight. Why is it hard? (a) the cap is sticky (b) air inside pushes back (c) the bottle is magnetic (d) water is hiding there
20. 20.🔮 Why do we try the card trick over a sink or a bucket? (a) to grow plants (b) to cool the glass (c) to catch any spills (d) to make it rain
21. 21.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? True or false: the same glass is the one thing we change. (a) False (b) True
22. 22.🧺 Which of these is needed for the card-on-a-glass trick? (a) a mirror (b) a magnet (c) turmeric powder (d) a towel
23. 23.🧺 Do we need a balloon for the card-on-a-glass trick? (a) not needed (b) needed
24. 24.🧺 Which of these is needed for the card-on-a-glass trick? (a) a balloon (b) a sink or a bucket (c) yeast (d) turmeric powder
25. 25.🧺 Three of these are needed for the card-on-a-glass trick. Which one is NOT needed? (a) a glass of water (b) yeast (c) a towel (d) a sink or a bucket
26. 26.🛟 Where should you do the card-and-glass trick? (a) on a bed (b) over a laptop (c) over a sink or bucket (d) near a plug point
27. 27.🧺 Do we need a magnet for the card-on-a-glass trick? (a) needed (b) not needed
28. 28.True or false: a bicycle pump works by magnetism. (a) False (b) True
29. 29.🥛 Which of these works by magnetism? (a) a suction hook (b) a magnetic chess set (c) a drinking straw (d) a vacuum cleaner
30. 30.🥛 Does a vacuum cleaner work by air pressure or by magnetism? (a) magnetism (b) air pressure
31. 31.🥛 Does a bicycle pump work by air pressure or by magnetism? (a) magnetism (b) air pressure
32. 32.True or false: a battery cell is needed for the card-on-a-glass trick. (a) True (b) False
33. 33.🧺 Which of these is needed for the card-on-a-glass trick? (a) a mirror (b) turmeric powder (c) a magnet (d) a stiff postcard
34. 34.🔮 Predict: you blow up a balloon. What fills it? (a) sand (b) smoke (c) air (d) water
35. 35.🥤 Why does juice go up a drinking straw when you sip? (a) the straw is magnetic (b) air pushes it up (c) juice likes plastic (d) the straw is hot
36. 36.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? Which of these is what we measure? (a) the same glass (b) whether the card stays (c) how full the glass is (d) the way we turn it
37. 37.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? True or false: the same card is kept the same. (a) False (b) True
38. 38.🧺 Do we need a glass of water for the card-on-a-glass trick? (a) not needed (b) needed
39. 39.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? What do we do with “the way we turn it”? (a) we keep it the same (b) we measure it (c) we change it
40. 40.🥛 Does a fridge magnet work by air pressure or by magnetism? (a) air pressure (b) magnetism

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