Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 185 · 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) flick coins at faces (c) stand on the ruler (d) bend it till it snaps
2. 2.⚙️ Which simple machine is a crane? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
3. 3.⚖️ 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 measure it (c) we change it
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) turmeric powder (c) a 30 cm ruler (d) a round pencil
5. 5.⚙️ Which simple machine is a ramp? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
8. 8.⚖️ 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 keep it the same (c) we change it
9. 9.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
10. 10.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
11. 11.True or false: a flat table is needed for the ruler lever. (a) True (b) False
12. 12.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
13. 13.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they may swallow them (d) they are too shiny
14. 14.⚖️ 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) the same ruler (c) the number of coins (d) which side goes down
15. 15.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
16. 16.True or false: a doorknob uses a pulley. (a) True (b) False
17. 17.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
18. 18.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
19. 19.⚙️ Which simple machine is a flagpole? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) coins of one kind (c) a 30 cm ruler (d) a flat table
21. 21.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit farther from middle (c) sit on the middle (d) sit closer to middle
22. 22.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a battery cell (c) a round pencil (d) coins of one kind
23. 23.⚖️ 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 keep it the same (c) we change it
24. 24.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
25. 25.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) a battery cell
26. 26.⚖️ 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) which side goes down (d) the number of coins
27. 27.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
28. 28.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a mirror (c) a round pencil (d) a magnet
29. 29.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
30. 30.⚖️ 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?
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) a balloon
32. 32.⚖️ 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
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
34. 34.🧺 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 balloon (d) a round pencil
35. 35.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) coins of one kind (c) a magnet (d) a balloon
36. 36.True or false: a see-saw is a lever. (a) True (b) False
37. 37.⚖️ 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
38. 38.True or false: a crane is a lever. (a) True (b) False
39. 39.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) turmeric powder (d) a round pencil
40. 40.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) coins of one kind (c) a flat table (d) a 30 cm ruler

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