Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 569 · 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.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
2. 2.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) sit farther from middle (d) jump up and down
3. 3.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
4. 4.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) zero (d) bigger on the left
5. 5.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
6. 6.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a mirror (d) coins of one kind
8. 8.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
9. 9.🔮 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 left side (d) the right side
10. 10.⚖️ 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 keep it the same (b) we change it (c) we measure it
11. 11.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a magnet (c) a battery cell (d) a 30 cm ruler
12. 12.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) turmeric powder
14. 14.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
15. 15.⚖️ 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) where the pencil is
16. 16.True or false: a magnet is needed for the ruler lever. (a) True (b) False
17. 17.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
18. 18.⚙️ Which of these uses a pulley? (a) a tap handle (b) a slide (c) a steering wheel (d) a flagpole
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
20. 20.True or false: a crane is a lever. (a) False (b) True
21. 21.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) a battery cell (d) a flat table
22. 22.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a magnet (c) a balloon (d) a round pencil
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) a battery cell
24. 24.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
25. 25.True or false: a flat table is needed for the ruler lever. (a) False (b) True
26. 26.⚖️ 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 measure it (c) we keep it the same
27. 27.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the spoon is magnetic (c) the lid gets softer (d) the spoon is hot
28. 28.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a balloon (d) a flat table
30. 30.⚖️ 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 measure it (b) we change it (c) we keep it the same
31. 31.⚖️ 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 kind of coins (b) the same ruler (c) distance from the pencil (d) which side goes down
32. 32.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are too cold (d) they are magnetic
33. 33.True or false: a bottle opener is an inclined plane. (a) False (b) True
34. 34.⚖️ 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
35. 35.⚖️ 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) True (b) False
36. 36.⚙️ Which simple machine is a flagpole? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
37. 37.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
38. 38.True or false: a flagpole uses a pulley. (a) True (b) False
39. 39.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a flagpole (c) a see-saw (d) a tap handle
40. 40.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed

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