Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 52 · 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 30 cm ruler is needed for the ruler lever. (a) True (b) False
2. 2.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) yeast (c) a battery cell (d) a 30 cm ruler
3. 3.True or false: a sloping road is a lever. (a) False (b) True
4. 4.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
5. 5.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit closer to middle (c) sit on the middle (d) sit farther from middle
6. 6.True or false: yeast is needed for the ruler lever. (a) False (b) True
7. 7.True or false: a balloon is needed for the ruler lever. (a) True (b) False
8. 8.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a 30 cm ruler (c) a round pencil (d) a flat table
9. 9.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
10. 10.🔮 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) neither, it balances (d) the right side
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a magnet (c) a round pencil (d) a flat table
12. 12.🧺 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 mirror
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
14. 14.⚙️ Which simple machine is a doorknob? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
15. 15.⚖️ 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
16. 16.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
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 change it (b) we keep it the same (c) we measure it
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
19. 19.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) flick coins at faces (d) bend it till it snaps
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a battery cell
21. 21.⚙️ Which simple machine is a ramp? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
22. 22.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
23. 23.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
24. 24.⚖️ 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 number of coins
25. 25.True or false: a mirror is needed for the ruler lever. (a) False (b) True
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
27. 27.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
28. 28.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
29. 29.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
30. 30.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) turmeric powder (c) coins of one kind (d) yeast
31. 31.⚖️ 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 same ruler (c) the number of coins (d) the kind of coins
32. 32.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
33. 33.⚖️ 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
34. 34.⚙️ Which of these uses a pulley? (a) a crane (b) a see-saw (c) a sloping road (d) a crowbar
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) the same ruler (c) which side goes down (d) distance from the pencil
36. 36.⚖️ 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) True (b) False
37. 37.True or false: a bottle opener uses a pulley. (a) False (b) True
38. 38.True or false: a bottle opener is a lever. (a) False (b) True
39. 39.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
40. 40.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) the spoon is hot (d) a lever boosts your push

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