Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 510 · 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 30 cm ruler (b) a flat table (c) a battery cell (d) a round pencil
2. 2.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
3. 3.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) True (b) False
4. 4.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
5. 5.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) a balloon
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
8. 8.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the number of coins (b) the kind of coins (c) the same ruler (d) which side goes down
9. 9.True or false: a bottle opener is an inclined plane. (a) True (b) False
10. 10.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) bigger on the left (d) zero
11. 11.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
12. 12.🔮 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 left side (d) the right side
13. 13.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a battery cell (c) a flat table (d) yeast
14. 14.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) bend it till it snaps (d) flick coins at faces
15. 15.⚖️ 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) the kind of coins (b) the number of coins (c) where the pencil is (d) distance from the pencil
16. 16.True or false: a bottle opener is a wheel and axle. (a) False (b) True
17. 17.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
18. 18.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
20. 20.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a balloon (c) turmeric powder (d) a 30 cm ruler
21. 21.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a ramp (c) a well pulley (d) a crowbar
22. 22.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
23. 23.⚙️ Which simple machine is a sloping road? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
24. 24.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
25. 25.⚖️ 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) False (b) True
26. 26.⚙️ Which simple machine is a steering wheel? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
27. 27.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a mirror (d) a 30 cm ruler
29. 29.⚖️ 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) False (b) True
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
31. 31.⚖️ 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
32. 32.⚖️ 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 keep it the same (b) we change it (c) we measure it
33. 33.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) True (b) False
35. 35.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
36. 36.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
37. 37.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
38. 38.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
39. 39.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are magnetic (d) they are too shiny
40. 40.True or false: a mirror is needed for the ruler lever. (a) True (b) False

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