Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 514 · 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.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a flat table (d) a balloon
2. 2.🔮 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) the left side (d) both go up
3. 3.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) easier (d) impossible
4. 4.⚙️ Which of these uses a pulley? (a) a see-saw (b) a steering wheel (c) a flagpole (d) a slide
5. 5.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
6. 6.⚖️ 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
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) yeast (d) a 30 cm ruler
8. 8.True or false: a see-saw is a lever. (a) True (b) False
9. 9.True or false: yeast is needed for the ruler lever. (a) True (b) False
10. 10.⚙️ Which simple machine is a slide? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
11. 11.True or false: a flagpole uses a pulley. (a) True (b) False
12. 12.⚖️ 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) where the pencil is (d) the kind of coins
13. 13.⚖️ 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 keep it the same (b) we change it (c) we measure it
14. 14.⚖️ 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 same ruler (c) the kind of coins (d) where the pencil is
15. 15.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) True (b) False
16. 16.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
17. 17.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a flat table (c) a mirror (d) turmeric powder
18. 18.True or false: a crowbar uses a pulley. (a) True (b) False
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 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?
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) True (b) False
21. 21.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
22. 22.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
23. 23.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) equal on both sides (d) bigger on the left
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a battery cell (c) a round pencil (d) a 30 cm ruler
25. 25.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) where the pencil is (b) distance from the pencil (c) which side goes down
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 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?
27. 27.🛟 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
28. 28.True or false: a steering wheel is a wheel and axle. (a) False (b) True
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 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?
30. 30.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
32. 32.⚖️ 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
33. 33.True or false: a magnet is needed for the ruler lever. (a) False (b) True
34. 34.True or false: a crane uses a pulley. (a) True (b) False
35. 35.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
36. 36.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
37. 37.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a sloping road (c) a well pulley (d) a crane
38. 38.⚖️ 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?
39. 39.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a sloping road (c) a well pulley (d) a bottle opener
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?

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