Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 228 · 40 questions

What you do (Coins × distance): 1. Balance the ruler on the pencil at its 15 cm mark. 2. Put coins at a measured distance on the left side. 3. Place coins on the right and slide them until the ruler balances. 4. Check: coins × distance on the left = coins × distance on the right; press gently.

1. 1.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) bend it till it snaps (d) press it gently
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) harder (d) easier
3. 3.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we change it (b) we keep it the same (c) we measure it
4. 4.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the number of coins”? (a) we change it (b) we keep it the same (c) we measure it
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “distance from the pencil”? (a) we measure it (b) we keep it the same (c) we change it
8. 8.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) True (b) False
9. 9.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the spoon is hot (c) the spoon is magnetic (d) the lid gets softer
10. 10.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
11. 11.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
12. 12.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a magnet
13. 13.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they are magnetic (d) they may swallow them
14. 14.True or false: a see-saw uses a pulley. (a) True (b) False
15. 15.⚙️ Which simple machine is a well pulley? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
17. 17.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is the one thing we change? (a) which side goes down (b) distance from the pencil (c) the same ruler (d) the kind of coins
18. 18.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the right side (b) the left side (c) both go up (d) neither, it balances
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) where the pencil is (c) the same ruler (d) which side goes down
20. 20.True or false: a well pulley is a wheel and axle. (a) False (b) True
21. 21.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a round pencil (c) yeast (d) turmeric powder
22. 22.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) turmeric powder (c) coins of one kind (d) a round pencil
23. 23.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
24. 24.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
25. 25.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we measure it (b) we change it (c) we keep it the same
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
28. 28.True or false: a mirror is needed for the ruler lever. (a) True (b) False
29. 29.True or false: a slide is an inclined plane. (a) False (b) True
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) True (b) False
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False
32. 32.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a battery cell (c) a flat table (d) coins of one kind
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a 30 cm ruler (c) coins of one kind (d) a round pencil
35. 35.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
36. 36.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) yeast (c) a 30 cm ruler (d) coins of one kind
37. 37.True or false: yeast is needed for the ruler lever. (a) True (b) False
38. 38.⚙️ Which of these is an inclined plane? (a) a slide (b) a steering wheel (c) a spoon lifting a lid (d) a crowbar
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a mirror (d) a round pencil

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