Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 705 · 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 of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a battery cell
2. 2.⚖️ 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 change it (b) we measure it (c) we keep it the same
3. 3.⚖️ 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 measure it (c) we keep it the same
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) distance from the pencil (b) the same ruler (c) the number of coins (d) which side goes down
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) True (b) False
6. 6.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a balloon (c) a flat table (d) coins of one kind
8. 8.True or false: yeast is not needed for the ruler lever. (a) False (b) True
9. 9.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) stand on the ruler (d) flick coins at faces
10. 10.⚙️ Which of these is a lever? (a) a doorknob (b) a steering wheel (c) a slide (d) a spoon lifting a lid
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 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?
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a round pencil (d) a mirror
13. 13.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
14. 14.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the right side (b) both go up (c) the left side (d) neither, it balances
15. 15.⚙️ Which simple machine is a doorknob? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
16. 16.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a magnet (d) a flat table
17. 17.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
18. 18.⚙️ Which of these is an inclined plane? (a) a ramp (b) a crowbar (c) a tap handle (d) a bottle opener
19. 19.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
20. 20.True or false: a slide uses a pulley. (a) True (b) False
21. 21.🧺 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
22. 22.True or false: a balloon is needed for the ruler lever. (a) False (b) True
23. 23.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a magnet (d) coins of one kind
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
25. 25.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
26. 26.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) zero (d) equal on both sides
27. 27.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) a mirror
28. 28.True or false: a tap handle is a wheel and axle. (a) True (b) False
29. 29.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a round pencil (d) a mirror
30. 30.⚙️ Which of these is a lever? (a) a ramp (b) a see-saw (c) a crane (d) a doorknob
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 5 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
33. 33.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are magnetic (d) they are too shiny
34. 34.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
35. 35.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a balloon (c) a round pencil (d) coins of one kind
36. 36.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
37. 37.True or false: a flagpole uses a pulley. (a) True (b) False
38. 38.⚖️ 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 change it (b) we keep it the same (c) we measure it
39. 39.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a magnet (c) coins of one kind (d) a balloon
40. 40.⚖️ 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

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