Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 787 · 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 uses a pulley? (a) a bottle opener (b) a sloping road (c) a see-saw (d) a well pulley
2. 2.⚖️ 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 number of coins (b) the same ruler (c) distance from the pencil (d) the kind of coins
3. 3.⚙️ Which simple machine is a steering wheel? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
4. 4.⚖️ 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) False (b) True
5. 5.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
6. 6.⚖️ 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) False (b) True
7. 7.⚙️ Which of these is a lever? (a) a bottle opener (b) a ramp (c) a sloping road (d) a steering wheel
8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) a magnet
9. 9.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) a 30 cm ruler (c) a flat table (d) coins of one kind
10. 10.⚖️ 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 change it (b) we keep it the same (c) we measure it
11. 11.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a round pencil (d) a balloon
12. 12.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too shiny (d) they are too cold
13. 13.⚖️ 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
14. 14.⚙️ Which simple machine is a doorknob? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
16. 16.True or false: a flat table is needed for the ruler lever. (a) True (b) False
17. 17.True or false: a mirror is needed for the ruler lever. (a) False (b) True
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) coins of one kind (c) a flat table (d) a 30 cm ruler
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) where the pencil is (c) distance from the pencil
21. 21.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) bend it till it snaps (d) press it gently
22. 22.True or false: a see-saw is a lever. (a) False (b) True
23. 23.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
24. 24.⚖️ 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 change it (b) we keep it the same (c) we measure it
25. 25.True or false: a magnet is needed for the ruler lever. (a) True (b) False
26. 26.⚖️ 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 change it (b) we measure it (c) we keep it the same
27. 27.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
28. 28.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
29. 29.⚙️ Which of these uses a pulley? (a) a crowbar (b) a crane (c) a tap handle (d) a spoon lifting a lid
30. 30.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a doorknob (c) a well pulley (d) a ramp
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 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.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
33. 33.True or false: a crowbar is a lever. (a) True (b) False
34. 34.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) coins of one kind (c) a flat table (d) a round pencil
36. 36.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a slide (c) a crane (d) a doorknob
37. 37.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) a battery cell (d) a 30 cm ruler
38. 38.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) bigger on the left (d) always 10
39. 39.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible
40. 40.🧺 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) yeast

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