Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 803 · 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 round pencil is not needed for the ruler lever. (a) False (b) True
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a mirror (c) coins of one kind (d) a flat table
3. 3.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
4. 4.⚖️ 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 measure it (b) we change it (c) we keep it the same
5. 5.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) where the pencil is (c) distance from the pencil
7. 7.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) press it gently (d) flick coins at faces
8. 8.🔮 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 right side (c) the left side (d) both go up
9. 9.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
10. 10.🧺 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 balloon
11. 11.⚖️ 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
12. 12.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a doorknob (c) a ramp (d) a sloping road
13. 13.⚙️ Which of these is a lever? (a) a ramp (b) a crane (c) a doorknob (d) a spoon lifting a lid
14. 14.True or false: a slide is a wheel and axle. (a) True (b) False
15. 15.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
16. 16.⚖️ 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
17. 17.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a battery cell
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) the number of coins (c) distance from the pencil
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 1 cm to the left of the pencil. How many coins must you place 3 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? True or false: the same ruler is kept the same. (a) False (b) True
22. 22.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a round pencil (c) a balloon (d) yeast
23. 23.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) always 10 (d) equal on both sides
24. 24.🛟 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
25. 25.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
26. 26.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
27. 27.⚖️ 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) False (b) True
28. 28.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
29. 29.True or false: a well pulley uses a pulley. (a) False (b) True
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 kept the same. (a) True (b) False
31. 31.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a balloon (c) a 30 cm ruler (d) a round pencil
32. 32.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
33. 33.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) yeast (d) a 30 cm ruler
34. 34.⚙️ Which of these is a lever? (a) a doorknob (b) a tap handle (c) a flagpole (d) a bottle opener
35. 35.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is magnetic (c) a lever boosts your push (d) the spoon is hot
36. 36.⚖️ 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 keep it the same (c) we measure it
37. 37.⚙️ Which of these is a lever? (a) a crane (b) a steering wheel (c) a well pulley (d) a crowbar
38. 38.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a battery cell (c) a magnet (d) coins of one kind
39. 39.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
40. 40.⚖️ 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) False (b) True

Free science experiments lessons, practice and worksheets at talentjr.in/science-experiments-for-kids