Lever Experiment Worksheet

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

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