Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 687 · 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.🔮 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) both go up (d) the left side
2. 2.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
3. 3.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a ramp (c) a crane (d) a see-saw
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 8 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a mirror (d) a 30 cm ruler
6. 6.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
7. 7.⚖️ 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 keep it the same (b) we change it (c) we measure it
8. 8.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a 30 cm ruler (c) yeast (d) a magnet
9. 9.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
10. 10.True or false: a spoon lifting a lid is an inclined plane. (a) False (b) True
11. 11.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) True (b) False
12. 12.True or false: a well pulley uses a pulley. (a) True (b) False
13. 13.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are too shiny (d) they are magnetic
14. 14.⚖️ 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) True (b) False
15. 15.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
16. 16.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a mirror (c) a balloon (d) a battery cell
17. 17.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) the same (d) harder
18. 18.True or false: a balloon is needed for the ruler lever. (a) False (b) True
19. 19.⚖️ 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) distance from the pencil (b) the kind of coins (c) the number of coins (d) where the pencil is
20. 20.⚖️ 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) False (b) True
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
22. 22.⚖️ 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 change it (c) we keep it the same
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
24. 24.True or false: a doorknob uses a pulley. (a) True (b) False
25. 25.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
26. 26.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit on the middle (d) sit farther from middle
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
28. 28.🧺 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
29. 29.⚖️ 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) distance from the pencil (c) where the pencil is
30. 30.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) turmeric powder (c) a 30 cm ruler (d) coins of one kind
32. 32.⚙️ Which simple machine is a slide? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
33. 33.🧺 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 magnet (d) a round pencil
34. 34.⚙️ Which of these is a lever? (a) a well pulley (b) a sloping road (c) a bottle opener (d) a doorknob
35. 35.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
36. 36.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) bend it till it snaps (d) flick coins at faces
37. 37.True or false: a tap handle is a wheel and axle. (a) True (b) False
38. 38.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
39. 39.True or false: a slide is a wheel and axle. (a) False (b) True
40. 40.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed

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