Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 735 · 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 simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
2. 2.⚖️ 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) True (b) False
3. 3.⚖️ 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 change it (c) we measure it
4. 4.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
5. 5.🛟 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
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 change it (b) we keep it the same (c) we measure it
7. 7.⚖️ 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 measure it (c) we keep it the same
8. 8.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a round pencil (d) a magnet
9. 9.⚙️ Which of these is a wheel and axle? (a) a slide (b) a doorknob (c) a crane (d) a flagpole
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) False (b) True
11. 11.⚖️ 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
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a 30 cm ruler (c) a round pencil (d) a flat table
13. 13.🔮 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 left side (c) both go up (d) the right side
14. 14.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
16. 16.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
17. 17.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
18. 18.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
19. 19.True or false: a bottle opener uses a pulley. (a) True (b) False
20. 20.True or false: a steering wheel uses a pulley. (a) True (b) False
21. 21.⚖️ 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 same ruler (b) the kind of coins (c) where the pencil is (d) distance from the pencil
22. 22.⚖️ 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 keep it the same (c) we change it
23. 23.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
24. 24.⚙️ Which simple machine is a sloping road? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
25. 25.True or false: a bottle opener is a lever. (a) True (b) False
26. 26.True or false: a tap handle is a wheel and axle. (a) False (b) True
27. 27.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) the same (d) impossible
28. 28.⚙️ Which of these uses a pulley? (a) a crane (b) a sloping road (c) a tap handle (d) a bottle opener
29. 29.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
30. 30.⚖️ 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) True (b) False
31. 31.⚖️ 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?
32. 32.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
33. 33.⚖️ 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 closer to middle (d) sit on the middle
34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) True (b) False
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) distance from the pencil (c) the kind of coins (d) which side goes down
36. 36.True or false: a tap handle uses a pulley. (a) True (b) False
37. 37.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) bigger on the left (d) equal on both sides
38. 38.True or false: a flagpole is a wheel and axle. (a) False (b) True
39. 39.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
40. 40.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) coins of one kind (d) a round pencil

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