Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 284 · 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 a wheel and axle? (a) a doorknob (b) a crane (c) a slide (d) a spoon lifting a lid
2. 2.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a 30 cm ruler (c) a battery cell (d) yeast
3. 3.True or false: a slide is a lever. (a) True (b) False
4. 4.⚖️ 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 keep it the same (c) we change it
5. 5.⚖️ 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 keep it the same (b) we measure it (c) we change it
6. 6.⚙️ Which of these is an inclined plane? (a) a crane (b) a ramp (c) a spoon lifting a lid (d) a bottle opener
7. 7.⚙️ Which simple machine is a crane? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
8. 8.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
9. 9.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) bend it till it snaps (c) stand on the ruler (d) flick coins at faces
10. 10.⚙️ Which of these uses a pulley? (a) a crowbar (b) a doorknob (c) a flagpole (d) a bottle opener
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a mirror (c) a flat table (d) a 30 cm ruler
12. 12.True or false: a flat table is needed for the ruler lever. (a) True (b) False
13. 13.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a mirror (c) a round pencil (d) a balloon
14. 14.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a 30 cm ruler (c) a flat table (d) a round pencil
15. 15.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) the same (d) easier
16. 16.⚖️ 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
17. 17.True or false: a balloon is needed for the ruler lever. (a) False (b) True
18. 18.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
19. 19.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a battery cell (c) turmeric powder (d) a flat table
20. 20.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they are magnetic (d) they may swallow them
21. 21.🧺 Do we need a 30 cm ruler 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 flat table (b) a 30 cm ruler (c) a round pencil (d) a balloon
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
24. 24.⚖️ 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) the number of coins
25. 25.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) always 10 (d) bigger on the left
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a 30 cm ruler (d) yeast
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
29. 29.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) yeast (c) a balloon (d) coins of one kind
30. 30.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit on the middle (d) sit closer to middle
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (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 same ruler is kept the same. (a) True (b) False
33. 33.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
34. 34.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
35. 35.True or false: a steering wheel is a wheel and axle. (a) True (b) False
36. 36.🧺 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 round pencil (d) a battery cell
37. 37.🔮 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) the right side (c) neither, it balances (d) the left side
38. 38.True or false: yeast is not needed for the ruler lever. (a) False (b) True
39. 39.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
40. 40.⚖️ 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) the kind of coins (c) where the pencil is (d) the number of coins

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