Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 853 · 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 are too cold (b) they are too shiny (c) they may swallow them (d) they are magnetic
2. 2.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) turmeric powder (d) coins of one kind
4. 4.⚖️ 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
5. 5.True or false: a bottle opener is a lever. (a) True (b) False
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
7. 7.True or false: a see-saw uses a pulley. (a) False (b) True
8. 8.🧺 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
9. 9.🔮 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) neither, it balances (c) the left side (d) both go up
10. 10.⚙️ Which simple machine is a crowbar? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
11. 11.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 5 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
13. 13.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) a 30 cm ruler (c) a flat table (d) a round pencil
14. 14.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
15. 15.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) flick coins at faces (d) stand on the ruler
16. 16.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) coins of one kind (c) a balloon (d) a magnet
17. 17.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
18. 18.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a crane (c) a well pulley (d) a spoon lifting a lid
19. 19.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) a flat table (d) coins of one kind
20. 20.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
21. 21.⚖️ 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
22. 22.⚙️ Which of these uses a pulley? (a) a flagpole (b) a slide (c) a see-saw (d) a steering wheel
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a mirror (d) coins of one kind
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 4 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.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
26. 26.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
29. 29.True or false: a ramp is a wheel and axle. (a) True (b) False
30. 30.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) yeast (d) a 30 cm ruler
32. 32.True or false: a slide is a lever. (a) False (b) True
33. 33.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
34. 34.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a flat table (c) turmeric powder (d) a battery cell
35. 35.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) equal on both sides (d) bigger on the left
36. 36.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) impossible (d) easier
37. 37.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
38. 38.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
39. 39.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
40. 40.⚙️ Which of these is a lever? (a) a crowbar (b) a well pulley (c) a crane (d) a doorknob

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