Air Pressure Experiment Worksheet

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

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