Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 884 · 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 the turning point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
2. 2.⚖️ 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 same ruler (b) distance from the pencil (c) the number of coins (d) which side goes down
3. 3.True or false: a see-saw is an inclined plane. (a) True (b) False
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
5. 5.🛟 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
6. 6.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a battery cell (c) a 30 cm ruler (d) a flat table
8. 8.⚙️ Which simple machine is a flagpole? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
9. 9.⚖️ 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) the same ruler
10. 10.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they may swallow them (d) they are too cold
11. 11.⚙️ Which simple machine is a sloping road? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
12. 12.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) yeast (c) a 30 cm ruler (d) coins of one kind
13. 13.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) equal on both sides (d) always 10
14. 14.🔮 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
15. 15.⚖️ 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 keep it the same (b) we measure it (c) we change it
16. 16.⚖️ 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
17. 17.True or false: a balloon is needed for the ruler lever. (a) True (b) False
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 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?
19. 19.⚖️ 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 change it (b) we measure it (c) we keep it the same
20. 20.True or false: a mirror is needed for the ruler lever. (a) True (b) False
21. 21.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
22. 22.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
23. 23.True or false: a crowbar uses a pulley. (a) False (b) True
24. 24.🧺 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) turmeric powder
25. 25.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
26. 26.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a balloon (c) yeast (d) turmeric powder
27. 27.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) False (b) True
31. 31.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
32. 32.True or false: a spoon lifting a lid is a wheel and axle. (a) True (b) False
33. 33.⚙️ Which of these is a lever? (a) a see-saw (b) a crane (c) a slide (d) a sloping road
34. 34.⚖️ 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
35. 35.True or false: yeast is not needed for the ruler lever. (a) True (b) False
36. 36.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) False (b) True
37. 37.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
38. 38.⚖️ 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
39. 39.True or false: a spoon lifting a lid is a lever. (a) True (b) False
40. 40.True or false: a flagpole is an inclined plane. (a) True (b) False

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