Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 370 · 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.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) flick coins at faces (d) bend it till it snaps
2. 2.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) coins of one kind (c) a battery cell (d) yeast
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
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 change it (b) we keep it the same (c) we measure it
5. 5.⚖️ 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) distance from the pencil (c) the number of coins
6. 6.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) turmeric powder (c) a flat table (d) a round pencil
8. 8.⚙️ Which simple machine is a see-saw? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
9. 9.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a well pulley (c) a sloping road (d) a crane
10. 10.True or false: a steering wheel is a wheel and axle. (a) True (b) False
11. 11.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) yeast (c) a round pencil (d) a 30 cm ruler
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 1 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) the same ruler (c) which side goes down
14. 14.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
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 number of coins (b) where the pencil is (c) distance from the pencil (d) the kind of coins
16. 16.⚖️ 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
17. 17.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
18. 18.🧺 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
19. 19.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
21. 21.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
22. 22.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a 30 cm ruler (d) a magnet
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) a magnet
24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) True (b) False
25. 25.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
26. 26.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
27. 27.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) zero (d) equal on both sides
28. 28.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the left side (b) both go up (c) the right side (d) neither, it balances
29. 29.⚙️ Which simple machine is a crowbar? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
31. 31.⚙️ Which of these is a lever? (a) a tap handle (b) a slide (c) a ramp (d) a spoon lifting a lid
32. 32.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a round pencil (c) a magnet (d) yeast
33. 33.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they may swallow them (d) they are magnetic
34. 34.True or false: a slide is a lever. (a) False (b) True
35. 35.⚖️ 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 change it (c) we keep it the same
36. 36.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) which side goes down (c) the kind of coins
38. 38.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
39. 39.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
40. 40.True or false: a spoon lifting a lid is a lever. (a) False (b) True

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