Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 282 · 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 an inclined plane? (a) a slide (b) a spoon lifting a lid (c) a flagpole (d) a well pulley
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) neither, it balances (d) the left side
3. 3.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) always 10 (d) bigger on the left
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) turmeric powder (d) a 30 cm ruler
5. 5.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a round pencil (d) a flat table
6. 6.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
7. 7.⚙️ Which of these is a lever? (a) a ramp (b) a well pulley (c) a crowbar (d) a slide
8. 8.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a round pencil (c) a magnet (d) a balloon
9. 9.⚖️ 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 measure it (c) we keep it the same
10. 10.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) yeast (c) a battery cell (d) a 30 cm ruler
11. 11.⚖️ 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 6 cm to the right to balance it?
12. 12.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a flat table (c) a magnet (d) a balloon
13. 13.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a ramp (c) a tap handle (d) a bottle opener
14. 14.⚖️ 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) distance from the pencil (c) the number of coins (d) the kind of coins
15. 15.True or false: a ramp uses a pulley. (a) False (b) True
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
17. 17.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) bend it till it snaps (c) flick coins at faces (d) stand on the ruler
18. 18.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they may swallow them (d) they are too shiny
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 keep it the same (b) we change it (c) we measure it
20. 20.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
21. 21.True or false: a see-saw is an inclined plane. (a) True (b) False
22. 22.True or false: a crowbar is an inclined plane. (a) True (b) False
23. 23.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
25. 25.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a crane (c) a doorknob (d) a crowbar
26. 26.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the kind of coins (b) the same ruler (c) distance from the pencil (d) which side goes down
28. 28.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) impossible (d) easier
29. 29.True or false: a flagpole uses a pulley. (a) False (b) True
30. 30.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a magnet (c) a flat table (d) a 30 cm ruler
32. 32.True or false: a ramp is an inclined plane. (a) False (b) True
33. 33.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
34. 34.⚖️ 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
35. 35.True or false: a mirror is needed for the ruler lever. (a) False (b) True
36. 36.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
37. 37.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
38. 38.⚙️ Which of these uses a pulley? (a) a doorknob (b) a well pulley (c) a tap handle (d) a crowbar
39. 39.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
40. 40.True or false: a flagpole is a lever. (a) True (b) False

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