Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 319 · 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) coins of one kind (b) a round pencil (c) a 30 cm ruler (d) a battery cell
2. 2.⚖️ 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) where the pencil is
3. 3.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) a magnet (d) a flat table
4. 4.🧺 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) a magnet
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) the right side (b) the left side (c) neither, it balances (d) both go up
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) the same ruler (c) distance from the pencil
7. 7.True or false: a sloping road is an inclined plane. (a) True (b) False
8. 8.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
9. 9.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
10. 10.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
11. 11.⚖️ 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
12. 12.⚖️ 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?
13. 13.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
14. 14.🧺 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 balloon (d) a flat table
15. 15.🧺 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 round pencil (d) a battery cell
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
17. 17.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too cold (d) they are too shiny
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
19. 19.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a flat table (c) a 30 cm ruler (d) coins of one kind
20. 20.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) turmeric powder (c) a round pencil (d) yeast
21. 21.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a magnet (d) a round pencil
22. 22.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
23. 23.True or false: a bottle opener is a lever. (a) False (b) True
24. 24.⚙️ Which simple machine is a see-saw? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
25. 25.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) impossible (d) the same
26. 26.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit closer to middle (d) sit on the middle
27. 27.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
28. 28.True or false: a well pulley is a lever. (a) False (b) True
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) which side goes down (c) the number of coins (d) the kind of coins
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 10 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
31. 31.⚙️ Which of these uses a pulley? (a) a slide (b) a spoon lifting a lid (c) a see-saw (d) a well pulley
32. 32.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) coins of one kind (c) a 30 cm ruler (d) a flat table
34. 34.⚖️ 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 keep it the same (c) we measure it
35. 35.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
36. 36.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the spoon is magnetic (c) a lever boosts your push (d) the lid gets softer
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
38. 38.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) stand on the ruler (d) flick coins at faces
39. 39.⚖️ 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) False (b) True
40. 40.⚖️ 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 kind of coins (b) which side goes down (c) distance from the pencil

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