Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 846 · 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.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
2. 2.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
3. 3.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) harder (d) easier
4. 4.⚖️ 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) distance from the pencil (b) which side goes down (c) the number of coins (d) the kind of coins
5. 5.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) a lever boosts your push (d) the spoon is magnetic
6. 6.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a balloon (c) a 30 cm ruler (d) coins of one kind
8. 8.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) neither, it balances (c) the right side (d) the left side
9. 9.⚖️ 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 measure it (b) we change it (c) we keep it the same
10. 10.⚖️ 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 change it (b) we measure it (c) we keep it the same
11. 11.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
12. 12.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are too shiny (d) they are magnetic
13. 13.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) equal on both sides (d) bigger on the left
14. 14.⚖️ 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 change it (b) we measure it (c) we keep it the same
15. 15.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a magnet (c) a 30 cm ruler (d) turmeric powder
16. 16.⚖️ 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) False (b) True
17. 17.⚙️ Which simple machine is a crowbar? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
18. 18.True or false: a well pulley is an inclined plane. (a) False (b) True
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
20. 20.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a battery cell (d) coins of one kind
21. 21.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
22. 22.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
23. 23.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a flat table (d) a battery cell
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
25. 25.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a flat table (d) yeast
26. 26.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
27. 27.True or false: a balloon is needed for the ruler lever. (a) True (b) False
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) the same ruler (c) which side goes down
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a battery cell (d) a round pencil
34. 34.True or false: a steering wheel is a wheel and axle. (a) False (b) True
35. 35.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
36. 36.True or false: a tap handle is a wheel and axle. (a) False (b) True
37. 37.True or false: a crowbar is a lever. (a) False (b) True
38. 38.🧺 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 flat table (d) a magnet
39. 39.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
40. 40.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) flick coins at faces (d) bend it till it snaps

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