Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 740 · 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 1 coin 10 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
2. 2.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a round pencil (c) a flat table (d) a 30 cm ruler
3. 3.🛟 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
4. 4.⚙️ Which of these is a lever? (a) a crowbar (b) a slide (c) a tap handle (d) a sloping road
5. 5.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
6. 6.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
7. 7.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) always 10 (c) zero (d) equal on both sides
8. 8.⚙️ Which of these is an inclined plane? (a) a ramp (b) a flagpole (c) a steering wheel (d) a doorknob
9. 9.True or false: yeast is needed for the ruler lever. (a) False (b) True
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a 30 cm ruler (d) a flat table
12. 12.⚙️ Which of these is a lever? (a) a well pulley (b) a see-saw (c) a crane (d) a ramp
13. 13.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
14. 14.⚖️ 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 change it (c) we keep it the same
15. 15.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 8 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
17. 17.⚙️ Which of these uses a pulley? (a) a crane (b) a tap handle (c) a crowbar (d) a see-saw
18. 18.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
19. 19.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
20. 20.True or false: a see-saw is a lever. (a) True (b) False
21. 21.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
22. 22.🧺 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 balloon
23. 23.⚖️ 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?
24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) turmeric powder
26. 26.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
27. 27.⚙️ Which of these is a wheel and axle? (a) a crane (b) a steering wheel (c) a sloping road (d) a slide
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
29. 29.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a magnet (c) a flat table (d) a battery cell
30. 30.🔮 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
31. 31.True or false: a flagpole uses a pulley. (a) False (b) True
32. 32.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) the same (d) impossible
33. 33.True or false: a crowbar is a lever. (a) False (b) True
34. 34.⚖️ 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
35. 35.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a balloon (c) a round pencil (d) a battery cell
36. 36.⚙️ Which of these is a lever? (a) a bottle opener (b) a slide (c) a sloping road (d) a crane
37. 37.⚙️ Which of these is a lever? (a) a sloping road (b) a flagpole (c) a well pulley (d) a spoon lifting a lid
38. 38.⚖️ 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) the kind of coins (c) the same ruler (d) which side goes down
39. 39.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
40. 40.True or false: a see-saw is a wheel and axle. (a) False (b) True

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