Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 876 · 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 sloping road (b) a crane (c) a see-saw (d) a spoon lifting a lid
2. 2.⚖️ 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 measure it (b) we keep it the same (c) we change it
3. 3.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
4. 4.⚖️ 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 measure it (b) we change it (c) we keep it the same
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) False (b) True
6. 6.⚖️ 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
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a magnet (c) a round pencil (d) a flat table
8. 8.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a battery cell (d) coins of one kind
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 3 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a 30 cm ruler (c) a flat table (d) a round pencil
12. 12.⚖️ 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 measure it (b) we change it (c) we keep it the same
13. 13.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too shiny (d) they are too cold
14. 14.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
16. 16.⚙️ Which simple machine is a slide? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
17. 17.🔮 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 right side (d) the left side
18. 18.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
19. 19.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
20. 20.🧺 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 30 cm ruler (d) a battery cell
21. 21.True or false: a steering wheel is a wheel and axle. (a) False (b) True
22. 22.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) coins of one kind (d) a magnet
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the number of coins (b) which side goes down (c) distance from the pencil
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 3 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
25. 25.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) False (b) True
26. 26.⚙️ Which of these uses a pulley? (a) a sloping road (b) a flagpole (c) a steering wheel (d) a bottle opener
27. 27.⚖️ 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 8 cm to the right to balance it?
28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a 30 cm ruler (c) a flat table (d) coins of one kind
29. 29.⚖️ 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
30. 30.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
31. 31.⚙️ Which of these is a lever? (a) a sloping road (b) a see-saw (c) a doorknob (d) a slide
32. 32.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the axle (d) the effort
33. 33.⚖️ 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) where the pencil is (c) distance from the pencil (d) the kind of coins
34. 34.True or false: a spoon lifting a lid is a lever. (a) False (b) True
35. 35.True or false: a crowbar is a wheel and axle. (a) False (b) True
36. 36.True or false: a mirror is needed for the ruler lever. (a) False (b) True
37. 37.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a battery cell (d) a 30 cm ruler
38. 38.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a sloping road (c) a doorknob (d) a well pulley
39. 39.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a steering wheel (c) a ramp (d) a crane
40. 40.True or false: a balloon is needed for the ruler lever. (a) True (b) False

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