Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 251 · 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 uses a pulley? (a) a crowbar (b) a steering wheel (c) a spoon lifting a lid (d) a crane
2. 2.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
3. 3.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
4. 4.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a balloon (c) a 30 cm ruler (d) a battery cell
5. 5.True or false: a mirror is needed for the ruler lever. (a) False (b) True
6. 6.🛟 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
7. 7.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a see-saw (c) a crowbar (d) a slide
8. 8.⚖️ 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) distance from the pencil (c) which side goes down (d) the same ruler
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 battery cell (b) a flat table (c) a balloon (d) yeast
11. 11.⚖️ 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) False (b) True
12. 12.⚙️ Which of these is a lever? (a) a well pulley (b) a crowbar (c) a crane (d) a ramp
13. 13.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) turmeric powder (d) coins of one kind
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 left side (b) the right side (c) neither, it balances (d) both go up
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 3 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
16. 16.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) bigger on the left (d) always 10
17. 17.⚖️ 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
18. 18.⚖️ 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
19. 19.True or false: a bottle opener is a lever. (a) True (b) False
20. 20.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a battery cell (d) a round pencil
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
22. 22.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
23. 23.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) False (b) True
25. 25.⚖️ 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) the number of coins (c) distance from the pencil (d) which side goes down
26. 26.🧺 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 magnet
27. 27.True or false: a crowbar is an inclined plane. (a) False (b) True
28. 28.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
29. 29.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a battery cell (c) a flat table (d) coins of one kind
30. 30.True or false: a tap handle is an inclined plane. (a) False (b) True
31. 31.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) yeast (c) a flat table (d) a 30 cm ruler
32. 32.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a well pulley (c) a sloping road (d) a crowbar
33. 33.🧺 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) turmeric powder
34. 34.⚖️ 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 measure it (b) we change it (c) we keep it the same
35. 35.🧺 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) turmeric powder
36. 36.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
37. 37.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
38. 38.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they are too cold (d) they may swallow them
39. 39.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
40. 40.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True

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