Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 776 · 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.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
3. 3.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a sloping road (c) a crowbar (d) a tap handle
4. 4.⚖️ 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) the kind of coins (c) the same ruler (d) distance from the pencil
5. 5.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
6. 6.⚙️ Which simple machine is a doorknob? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
7. 7.⚖️ 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
8. 8.True or false: yeast is needed for the ruler lever. (a) True (b) False
9. 9.⚖️ 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
10. 10.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) press it gently (d) flick coins at faces
11. 11.True or false: a magnet is needed for the ruler lever. (a) False (b) True
12. 12.⚖️ 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
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) False (b) True
15. 15.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) impossible (d) harder
16. 16.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a magnet (c) a battery cell (d) a 30 cm ruler
17. 17.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
18. 18.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a battery cell (c) a magnet (d) a round pencil
19. 19.⚖️ 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 change it (b) we measure it (c) we keep it the same
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 10 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
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 keep it the same (b) we change it (c) we measure it
22. 22.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) yeast (c) coins of one kind (d) a flat table
24. 24.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a mirror (c) a balloon (d) coins of one kind
25. 25.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a round pencil (d) coins of one kind
26. 26.⚖️ 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 5 cm to the right to balance it?
27. 27.True or false: a slide is a lever. (a) True (b) False
28. 28.⚙️ Which simple machine is a see-saw? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
29. 29.True or false: a bottle opener is a lever. (a) False (b) True
30. 30.⚙️ Which simple machine is a ramp? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
31. 31.⚖️ 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) True (b) False
32. 32.True or false: a flagpole is a wheel and axle. (a) False (b) True
33. 33.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
34. 34.⚙️ Which simple machine is a crane? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
35. 35.⚖️ 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
36. 36.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
37. 37.True or false: yeast is not needed for the ruler lever. (a) True (b) False
38. 38.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) False (b) True
40. 40.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a doorknob (c) a crowbar (d) a ramp

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