Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 990 · 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.🛟 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
2. 2.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
3. 3.⚙️ Which of these is a lever? (a) a slide (b) a well pulley (c) a bottle opener (d) a tap handle
4. 4.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a mirror (d) a flat table
5. 5.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a magnet (c) a flat table (d) a 30 cm ruler
7. 7.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the axle (d) the fulcrum
8. 8.True or false: a spoon lifting a lid uses a pulley. (a) False (b) True
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 12 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?
10. 10.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
11. 11.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
12. 12.True or false: a magnet is needed for the ruler lever. (a) True (b) False
13. 13.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
14. 14.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
15. 15.🔮 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) the left side (d) neither, it balances
16. 16.⚖️ 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 measure it (b) we keep it the same (c) we change it
17. 17.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) zero (d) always 10
18. 18.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
19. 19.⚖️ 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 measure it (b) we change it (c) we keep it the same
20. 20.⚙️ Which simple machine is a crane? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
21. 21.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) a round pencil (d) a flat table
22. 22.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a well pulley (c) a spoon lifting a lid (d) a crowbar
23. 23.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a round pencil (c) a magnet (d) a battery cell
24. 24.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) yeast
26. 26.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a doorknob (c) a slide (d) a crane
27. 27.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
28. 28.⚖️ 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 measure it (b) we keep it the same (c) we change it
29. 29.True or false: a slide uses a pulley. (a) True (b) False
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
31. 31.⚖️ 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
32. 32.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a flagpole (c) a see-saw (d) a well pulley
33. 33.True or false: a spoon lifting a lid is an inclined plane. (a) True (b) False
34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) the number of coins (c) which side goes down (d) the same ruler
35. 35.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
36. 36.⚖️ 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) True (b) False
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) a battery cell
38. 38.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
39. 39.⚙️ Which simple machine is a tap handle? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
40. 40.🛟 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

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