Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 700 · 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 balloon is not needed for the ruler lever. (a) True (b) False
2. 2.🔮 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) the left side (d) neither, it balances
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
4. 4.True or false: a ramp is a lever. (a) True (b) False
5. 5.🧺 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 30 cm ruler (d) a magnet
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a balloon (d) a 30 cm ruler
7. 7.⚖️ 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
8. 8.⚖️ 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 2 cm to the right to balance it?
9. 9.⚙️ Which simple machine is a doorknob? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
10. 10.True or false: a crowbar uses a pulley. (a) True (b) False
11. 11.⚖️ 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) the kind of coins (c) the number of coins (d) which side goes down
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a round pencil (d) a battery cell
13. 13.🛟 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
14. 14.True or false: yeast is not needed for the ruler lever. (a) False (b) True
15. 15.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a battery cell (c) a round pencil (d) a mirror
16. 16.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
17. 17.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) False (b) True
18. 18.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
19. 19.True or false: a steering wheel uses a pulley. (a) False (b) True
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
21. 21.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
22. 22.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
24. 24.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) sit closer to middle (d) jump up and down
25. 25.⚙️ Which simple machine is a tap handle? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
26. 26.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) turmeric powder (c) coins of one kind (d) a 30 cm ruler
27. 27.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
28. 28.⚖️ 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
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 “which side goes down”? (a) we keep it the same (b) we measure it (c) we change it
31. 31.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
32. 32.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
33. 33.True or false: a slide is an inclined plane. (a) True (b) False
34. 34.⚖️ 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
35. 35.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a battery cell (c) a flat table (d) a round pencil
36. 36.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
37. 37.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
38. 38.⚖️ 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
39. 39.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) flick coins at faces (d) press it gently
40. 40.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a flat table (d) coins of one kind

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