Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 398 · 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.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) a balloon
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 measure it (b) we change it (c) we keep it the same
4. 4.⚙️ Which of these uses a pulley? (a) a sloping road (b) a doorknob (c) a spoon lifting a lid (d) a well pulley
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a round pencil (c) a flat table (d) coins of one kind
6. 6.⚖️ 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
7. 7.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the axle (c) the effort (d) the load
8. 8.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
9. 9.True or false: a slide is an inclined plane. (a) True (b) False
10. 10.True or false: yeast is not needed for the ruler lever. (a) True (b) False
11. 11.True or false: a bottle opener uses a pulley. (a) False (b) True
12. 12.⚖️ 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) where the pencil is (c) distance from the pencil
13. 13.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) a lever boosts your push (c) the spoon is magnetic (d) the spoon is hot
14. 14.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a 30 cm ruler (c) a battery cell (d) a mirror
15. 15.True or false: a tap handle is a wheel and axle. (a) True (b) False
16. 16.⚖️ 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
17. 17.⚖️ 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
18. 18.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a battery cell (c) a magnet (d) turmeric powder
19. 19.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
21. 21.True or false: a tap handle uses a pulley. (a) True (b) False
22. 22.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
23. 23.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
24. 24.🛟 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
25. 25.⚙️ Which simple machine is a doorknob? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
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) the number of coins (b) distance from the pencil (c) where the pencil is (d) which side goes down
27. 27.True or false: a bottle opener is a wheel and axle. (a) False (b) True
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) False (b) True
29. 29.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) a flat table (c) a round pencil (d) a 30 cm ruler
30. 30.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
31. 31.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are magnetic (d) they are too shiny
32. 32.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a balloon (c) a round pencil (d) a magnet
33. 33.🔮 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 right side (c) both go up (d) the left side
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a mirror (d) a 30 cm ruler
35. 35.⚙️ Which simple machine is a slide? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
36. 36.True or false: coins of one kind is needed for the ruler 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 the one thing we change. (a) False (b) True
38. 38.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
39. 39.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) a battery cell

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