Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 560 · 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 a wheel and axle? (a) a flagpole (b) a ramp (c) a steering wheel (d) a see-saw
2. 2.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) yeast (c) a 30 cm ruler (d) a magnet
3. 3.⚖️ 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 number of coins (c) which side goes down
4. 4.⚖️ 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
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
6. 6.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
7. 7.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) yeast (c) a battery cell (d) turmeric powder
8. 8.⚖️ 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 farther from middle (d) sit on the middle
9. 9.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
10. 10.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a flat table (d) a mirror
11. 11.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) always 10 (c) zero (d) equal on both sides
12. 12.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too cold (d) they are too shiny
13. 13.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is magnetic (c) a lever boosts your push (d) the spoon is hot
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
15. 15.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) coins of one kind (c) a magnet (d) a balloon
16. 16.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
17. 17.⚙️ Which of these uses a pulley? (a) a tap handle (b) a well pulley (c) a see-saw (d) a spoon lifting a lid
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a magnet (c) a flat table (d) coins of one kind
19. 19.🔮 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) the right side (c) neither, it balances (d) the left side
20. 20.⚙️ Which of these is a wheel and axle? (a) a crane (b) a tap handle (c) a see-saw (d) a slide
21. 21.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
22. 22.⚖️ 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) where the pencil is (c) the same ruler (d) the kind of coins
23. 23.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a battery cell (c) a flat table (d) yeast
24. 24.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
25. 25.True or false: yeast is not needed for the ruler lever. (a) True (b) False
26. 26.🧺 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 round pencil (d) a mirror
27. 27.⚖️ 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 1 cm to the right to balance it?
28. 28.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a ramp (c) a tap handle (d) a crane
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
30. 30.🧺 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
31. 31.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
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? What do we do with “which side goes down”? (a) we keep it the same (b) we change it (c) we measure it
34. 34.⚖️ 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?
35. 35.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a magnet (c) a flat table (d) a 30 cm ruler
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a flat table (c) a 30 cm ruler (d) coins of one kind
37. 37.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
38. 38.⚖️ 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
39. 39.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) False (b) True

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