Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 207 · 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.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) sit farther from middle (d) jump up and down
2. 2.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) False (b) True
3. 3.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) turmeric powder (d) a round pencil
4. 4.⚖️ 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
5. 5.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
6. 6.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
7. 7.True or false: a slide is an inclined plane. (a) True (b) False
8. 8.🔮 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) neither, it balances (c) the left side (d) the right side
9. 9.🧺 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 battery cell (d) a 30 cm ruler
10. 10.⚖️ 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 same ruler (b) which side goes down (c) distance from the pencil
11. 11.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
12. 12.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) False (b) True
13. 13.⚖️ 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 change it (b) we keep it the same (c) we measure it
14. 14.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
15. 15.True or false: a doorknob is an inclined plane. (a) True (b) False
16. 16.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
17. 17.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
19. 19.⚙️ Which of these uses a pulley? (a) a crowbar (b) a sloping road (c) a see-saw (d) a well pulley
20. 20.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
21. 21.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) a battery cell (d) a balloon
22. 22.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps
23. 23.⚖️ 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
24. 24.⚖️ 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) which side goes down (c) the kind of coins
25. 25.⚙️ Which simple machine is a bottle opener? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
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) where the pencil is (b) the kind of coins (c) the number of coins (d) distance from the pencil
27. 27.True or false: a doorknob is a wheel and axle. (a) False (b) True
28. 28.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a mirror (c) a round pencil (d) a balloon
29. 29.True or false: a mirror is needed for the ruler lever. (a) False (b) True
30. 30.⚖️ 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
31. 31.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
32. 32.⚖️ 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
33. 33.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a round pencil (c) coins of one kind (d) a flat table
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a 30 cm ruler (d) a round pencil
35. 35.⚖️ 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 change it (c) we keep it the same
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) turmeric powder (c) a flat table (d) a round pencil
37. 37.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
38. 38.True or false: a sloping road is an inclined plane. (a) True (b) False
39. 39.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
40. 40.True or false: a balloon is needed for the ruler lever. (a) True (b) False

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