Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 764 · 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 what we measure? (a) the number of coins (b) which side goes down (c) distance from the pencil (d) the kind of coins
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 keep it the same (b) we measure it (c) we change it
3. 3.🧺 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 round pencil (d) a battery cell
4. 4.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
5. 5.True or false: a doorknob is a wheel and axle. (a) False (b) True
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
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 30 cm ruler (d) yeast
8. 8.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too shiny (d) they are too cold
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) the kind of coins (b) which side goes down (c) distance from the pencil
10. 10.🔮 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
11. 11.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) bend it till it snaps (d) press it gently
12. 12.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a mirror (c) a balloon (d) a magnet
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 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?
14. 14.True or false: a crowbar is a lever. (a) True (b) False
15. 15.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) equal on both sides (c) zero (d) bigger on the left
16. 16.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
17. 17.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
18. 18.True or false: a bottle opener is an inclined plane. (a) True (b) False
19. 19.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
20. 20.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a flat table (d) a round pencil
21. 21.⚖️ 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
22. 22.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a battery cell (c) coins of one kind (d) a magnet
23. 23.True or false: a flagpole uses a pulley. (a) True (b) False
24. 24.⚙️ Which of these uses a pulley? (a) a see-saw (b) a spoon lifting a lid (c) a crane (d) a crowbar
25. 25.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the lid gets softer (c) the spoon is magnetic (d) the spoon is hot
26. 26.⚖️ 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 keep it the same (b) we measure it (c) we change it
27. 27.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
28. 28.⚖️ 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) True (b) False
29. 29.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
30. 30.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 1 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
32. 32.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a flat table (d) turmeric powder
33. 33.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
34. 34.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
35. 35.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a tap handle (c) a flagpole (d) a slide
36. 36.True or false: a steering wheel is a wheel and axle. (a) True (b) False
37. 37.True or false: a sloping road is a lever. (a) True (b) False
38. 38.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
39. 39.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
40. 40.True or false: a balloon is needed for the ruler lever. (a) False (b) True

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