Air Pressure Experiment Worksheet

Science experiments lesson 6: Air pressure: the card on a glass · Set 703 · 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.🥛 Why is it best to fill the glass right to the top? (a) water is heavier (b) it looks nicer (c) the card gets wet (d) little air left inside
2. 2.True or false: a stiff postcard is not needed for the card-on-a-glass trick. (a) False (b) True
3. 3.⚖️ 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
4. 4.🧺 Which of these is needed for the card-on-a-glass trick? (a) a mirror (b) a battery cell (c) turmeric powder (d) a towel
5. 5.🔮 Predict: you blow up a balloon. What fills it? (a) water (b) smoke (c) sand (d) air
6. 6.🧺 Do we need a sink or a bucket for the card-on-a-glass trick? (a) needed (b) not needed
7. 7.True or false: a magnetic pin holder works by air pressure. (a) True (b) False
8. 8.True or false: a glass of water is not needed for the card-on-a-glass trick. (a) False (b) True
9. 9.⚖️ 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 way we turn it (b) the same card (c) the same glass (d) whether the card stays
10. 10.🔍 Which is the odd one out? (a) a compass needle (b) a suction hook (c) a fridge magnet (d) a magnetic pin holder
11. 11.🥛 Which of these works by magnetism? (a) a vacuum cleaner (b) a drinking straw (c) a magnetic chess set (d) a bicycle pump
12. 12.🧺 Three of these are needed for the card-on-a-glass trick. Which one is NOT needed? (a) turmeric powder (b) a sink or a bucket (c) a towel (d) a stiff postcard
13. 13.True or false: a bicycle pump works by magnetism. (a) True (b) False
14. 14.⚖️ 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 kept the same. (a) False (b) True
15. 15.🥛 Which of these works by magnetism? (a) a magnetic pin holder (b) a vacuum cleaner (c) a bicycle pump (d) a suction hook
16. 16.True or false: a drinking straw works by air pressure. (a) True (b) False
17. 17.🥛 Does a magnetic chess set work by air pressure or by magnetism? (a) magnetism (b) air pressure
18. 18.True or false: a compass needle works by air pressure. (a) True (b) False
19. 19.📘 Air presses on everything around us. What is this push called? (a) magnetism (b) friction (c) sunlight (d) air pressure
20. 20.🧺 Which of these is not needed for the card-on-a-glass trick? (a) a stiff postcard (b) a glass of water (c) a towel (d) a balloon
21. 21.🥛 Does a suction hook work by air pressure or by magnetism? (a) air pressure (b) magnetism
22. 22.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? What do we do with “how full the glass is”? (a) we keep it the same (b) we change it (c) we measure it
23. 23.🧺 Which of these is needed for the card-on-a-glass trick? (a) a battery cell (b) a balloon (c) a glass of water (d) a mirror
24. 24.🔍 Which is the odd one out? (a) a magnetic chess set (b) a drinking straw (c) a fridge magnet (d) a magnetic pin holder
25. 25.🥛 What holds the card up against the upside-down glass? (a) the cold water (b) air pushing up (c) a magnet (d) glue on the card
26. 26.🔍 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 flies away (c) the card stays on (d) the water turns to ice
27. 27.⚖️ 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
28. 28.⚖️ 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 change it (b) we keep it the same (c) we measure it
29. 29.🧺 Do we need a magnet for the card-on-a-glass trick? (a) not needed (b) needed
30. 30.🥛 Does a vacuum cleaner work by air pressure or by magnetism? (a) air pressure (b) magnetism
31. 31.🛟 Where should you do the card-and-glass trick? (a) over a laptop (b) near a plug point (c) on a bed (d) over a sink or bucket
32. 32.True or false: a fridge magnet works by air pressure. (a) False (b) True
33. 33.🧺 Which of these is not needed for the card-on-a-glass trick? (a) a towel (b) a stiff postcard (c) a mirror (d) a sink or a bucket
34. 34.⚖️ 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
35. 35.True or false: a towel is not needed for the card-on-a-glass trick. (a) False (b) True
36. 36.⚖️ Fair test — does the card stay on with a full glass and with a half-full glass? Which of these is the one thing we change? (a) whether the card stays (b) the same glass (c) the same card (d) how full the glass is
37. 37.🧺 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 stiff postcard (d) a sink or a bucket
38. 38.True or false: a vacuum cleaner works by air pressure. (a) False (b) True
39. 39.🔮 Predict: you squeeze an empty plastic bottle with its cap screwed on tight. Why is it hard? (a) air inside pushes back (b) the bottle is magnetic (c) the cap is sticky (d) water is hiding there
40. 40.🛟 Why is a plastic cup safer than a glass for small children here? (a) it is heavier (b) it is magnetic (c) it is hotter (d) it will not break

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