Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 890 · 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.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
2. 2.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
3. 3.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
4. 4.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) a lever boosts your push (c) the spoon is magnetic (d) the spoon is hot
5. 5.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
6. 6.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a magnet
8. 8.⚖️ 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 keep it the same (b) we measure it (c) we change it
9. 9.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
10. 10.True or false: yeast is not needed for the ruler lever. (a) False (b) True
11. 11.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) a battery cell (d) a round pencil
12. 12.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) True (b) False
14. 14.⚖️ 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) False (b) True
15. 15.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) the number of coins (c) where the pencil is (d) the kind of coins
16. 16.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
17. 17.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
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) neither, it balances (b) both go up (c) the right side (d) the left side
19. 19.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a balloon (d) coins of one kind
21. 21.⚖️ 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) where the pencil is (c) the same ruler (d) distance from the pencil
22. 22.⚙️ Which simple machine is a slide? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
23. 23.True or false: a magnet is needed for the ruler lever. (a) True (b) False
24. 24.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) press it gently (d) stand on the ruler
25. 25.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) turmeric powder (c) a balloon (d) a 30 cm ruler
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
27. 27.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they may swallow them (d) they are too cold
28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a 30 cm ruler (c) a flat table (d) a round pencil
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
30. 30.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
31. 31.⚙️ Which of these is a lever? (a) a crane (b) a see-saw (c) a slide (d) a well pulley
32. 32.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a magnet (c) a battery cell (d) turmeric powder
33. 33.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we measure it (b) we change it (c) we keep it the same
34. 34.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) turmeric powder (c) a magnet (d) a mirror
35. 35.True or false: a flat table is needed for the ruler lever. (a) True (b) False
36. 36.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
37. 37.True or false: a see-saw is a lever. (a) False (b) True
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) True (b) False
39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) True (b) False
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?

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