Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 870 · 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 a flat table for the ruler lever? (a) needed (b) not needed
2. 2.True or false: a tap handle is an inclined plane. (a) False (b) True
3. 3.True or false: a bottle opener uses a pulley. (a) False (b) True
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we measure it (b) we change it (c) we keep it the same
5. 5.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a balloon (c) a magnet (d) a battery cell
6. 6.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they are magnetic (d) they may swallow them
7. 7.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
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) the right side (b) neither, it balances (c) both go up (d) the left side
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
10. 10.⚖️ 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) where the pencil is (b) distance from the pencil (c) the same ruler (d) the number of coins
11. 11.⚖️ 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) False (b) True
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 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?
13. 13.True or false: a mirror is needed for the ruler lever. (a) True (b) False
14. 14.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
15. 15.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
16. 16.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a round pencil (c) a 30 cm ruler (d) a flat table
18. 18.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
19. 19.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) bigger on the left (c) always 10 (d) zero
20. 20.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
21. 21.⚖️ 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
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
23. 23.⚖️ 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?
24. 24.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
25. 25.True or false: turmeric powder is 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 “the kind of coins”? (a) we measure it (b) we change it (c) we keep it the same
27. 27.⚙️ Which of these uses a pulley? (a) a crane (b) a bottle opener (c) a see-saw (d) a slide
28. 28.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
29. 29.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
30. 30.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) True (b) False
32. 32.⚖️ 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
33. 33.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) a mirror (d) turmeric powder
34. 34.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a round pencil (d) a 30 cm ruler
35. 35.⚖️ 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
36. 36.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) True (b) False
37. 37.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a balloon (c) a round pencil (d) a 30 cm ruler
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
39. 39.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the axle (c) the effort (d) the load
40. 40.⚖️ 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 2 cm to the right to balance it?

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