Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 908 · 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.⚖️ 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 same ruler (b) where the pencil is (c) which side goes down (d) distance from the pencil
2. 2.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
3. 3.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we keep it the same (b) we change it (c) we measure it
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 6 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 30 cm ruler (b) coins of one kind (c) a flat table (d) a magnet
6. 6.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
8. 8.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they are magnetic (d) they may swallow them
9. 9.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
10. 10.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
11. 11.🔮 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
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the number of coins (b) distance from the pencil (c) which side goes down
14. 14.⚙️ Which of these uses a pulley? (a) a slide (b) a spoon lifting a lid (c) a doorknob (d) a crane
15. 15.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a slide (c) a tap handle (d) a well pulley
16. 16.True or false: a magnet is needed for the ruler lever. (a) True (b) False
17. 17.True or false: yeast is needed for the ruler lever. (a) True (b) False
18. 18.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
19. 19.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the axle (d) the fulcrum
20. 20.True or false: a tap handle is a wheel and axle. (a) False (b) True
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a balloon (c) a flat table (d) coins of one kind
22. 22.⚖️ 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?
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
24. 24.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
26. 26.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a round pencil (c) a balloon (d) a battery cell
27. 27.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
28. 28.⚖️ 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) False (b) True
29. 29.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) press it gently (d) stand on the ruler
30. 30.⚖️ 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 change it (c) we keep it the same
31. 31.⚖️ 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) which side goes down (b) distance from the pencil (c) the kind of coins (d) the same ruler
32. 32.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the spoon is hot (c) a lever boosts your push (d) the lid gets softer
33. 33.⚙️ Which simple machine is a well pulley? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
34. 34.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
35. 35.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) turmeric powder (c) a balloon (d) yeast
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 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?
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 12 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
38. 38.⚖️ 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) True (b) False
39. 39.True or false: a ramp is an inclined plane. (a) False (b) True
40. 40.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a battery cell (c) a magnet (d) turmeric powder

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