Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 541 · 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.True or false: a balloon is needed for the ruler lever. (a) False (b) True
2. 2.🧺 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 mirror
3. 3.⚙️ Which of these is a lever? (a) a flagpole (b) a see-saw (c) a well pulley (d) a doorknob
4. 4.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
5. 5.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the left side (c) both go up (d) the right side
6. 6.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too shiny (c) they are too cold (d) they are magnetic
7. 7.⚖️ 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 same ruler (b) distance from the pencil (c) the number of coins (d) the kind of coins
8. 8.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
9. 9.⚖️ 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) the kind of coins (c) distance from the pencil
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
11. 11.⚙️ Which simple machine is a crowbar? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
12. 12.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a balloon (c) a 30 cm ruler (d) a magnet
13. 13.⚙️ Which simple machine is a steering wheel? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a battery cell (c) coins of one kind (d) a flat table
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a magnet (c) coins of one kind (d) a flat table
16. 16.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
17. 17.⚖️ 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 measure it (b) we change it (c) we keep it the same
18. 18.True or false: a well pulley is a wheel and axle. (a) True (b) False
19. 19.🧺 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 mirror (d) a flat table
20. 20.True or false: a steering wheel is a wheel and axle. (a) False (b) True
21. 21.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) equal on both sides (d) always 10
22. 22.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) turmeric powder (c) a round pencil (d) yeast
23. 23.⚙️ Which simple machine is a slide? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
24. 24.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
25. 25.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
26. 26.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) bend it till it snaps (d) press it gently
27. 27.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
28. 28.True or false: a see-saw uses a pulley. (a) True (b) False
29. 29.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a flagpole (c) a sloping road (d) a bottle opener
30. 30.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a battery cell (c) a 30 cm ruler (d) a round pencil
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
32. 32.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
33. 33.🧺 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 flat table (d) turmeric powder
34. 34.⚖️ 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 same ruler (b) distance from the pencil (c) where the pencil is (d) which side goes down
35. 35.True or false: a crane uses a pulley. (a) True (b) False
36. 36.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
37. 37.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
39. 39.⚖️ 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 keep it the same (c) we change it
40. 40.⚙️ Which simple machine is a bottle opener? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley

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