Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 248 · 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.⚖️ 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) where the pencil is (b) the same ruler (c) the kind of coins (d) distance from the pencil
2. 2.⚖️ 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 change it (b) we keep it the same (c) we measure it
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a 30 cm ruler (d) a round pencil
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 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?
5. 5.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
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) distance from the pencil (b) the same ruler (c) which side goes down
7. 7.True or false: a steering wheel is an inclined plane. (a) True (b) False
8. 8.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we measure it (b) we change it (c) we keep it the same
10. 10.⚙️ Which of these uses a pulley? (a) a crowbar (b) a ramp (c) a well pulley (d) a slide
11. 11.True or false: a slide is a wheel and axle. (a) True (b) False
12. 12.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
13. 13.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
14. 14.⚖️ 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
15. 15.True or false: a sloping road uses a pulley. (a) False (b) True
16. 16.⚖️ 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
17. 17.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
18. 18.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False
20. 20.⚙️ Which of these is a lever? (a) a crane (b) a see-saw (c) a tap handle (d) a sloping road
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) turmeric powder (d) coins of one kind
22. 22.True or false: a flat table is needed for the ruler lever. (a) False (b) True
23. 23.True or false: a tap handle is a wheel and axle. (a) True (b) False
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a mirror (c) a round pencil (d) a 30 cm ruler
25. 25.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
27. 27.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a mirror (c) coins of one kind (d) a 30 cm ruler
28. 28.True or false: a doorknob is a wheel and axle. (a) False (b) True
29. 29.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are too shiny (d) they are magnetic
30. 30.True or false: a slide is a lever. (a) False (b) True
31. 31.True or false: a see-saw uses a pulley. (a) False (b) True
32. 32.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
33. 33.⚖️ 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
34. 34.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) the same (d) impossible
35. 35.⚙️ Which simple machine is a see-saw? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
36. 36.True or false: a tap handle is an inclined plane. (a) False (b) True
37. 37.⚖️ 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?
38. 38.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a round pencil (d) a battery cell
39. 39.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a balloon (c) a flat table (d) a 30 cm ruler
40. 40.🔮 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

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