Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 483 · 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 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?
2. 2.True or false: a magnet is needed for the ruler lever. (a) False (b) True
3. 3.⚖️ 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) the kind of coins (c) which side goes down (d) distance from the pencil
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
5. 5.⚖️ 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) False (b) True
6. 6.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
7. 7.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a round pencil (c) a flat table (d) a 30 cm ruler
8. 8.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
9. 9.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) jump up and down (d) sit closer to middle
10. 10.🔮 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 left side (b) both go up (c) neither, it balances (d) the right side
11. 11.⚖️ 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 change it (b) we measure it (c) we keep it the same
12. 12.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) a mirror (d) a flat table
13. 13.⚖️ 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
14. 14.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) the same (d) impossible
15. 15.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a spoon lifting a lid (c) a crane (d) a sloping road
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
17. 17.True or false: a spoon lifting a lid is a wheel and axle. (a) False (b) True
18. 18.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) a lever boosts your push (c) the lid gets softer (d) the spoon is hot
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
20. 20.⚖️ 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) which side goes down (c) distance from the pencil
21. 21.⚖️ 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 same ruler (d) the number of coins
22. 22.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) yeast (d) coins of one kind
23. 23.⚙️ Which simple machine is a slide? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
24. 24.⚖️ 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
25. 25.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) True (b) False
26. 26.⚖️ 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
27. 27.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
28. 28.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
29. 29.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) bigger on the left (d) equal on both sides
30. 30.True or false: a crane is a lever. (a) True (b) False
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a balloon (d) coins of one kind
32. 32.True or false: a flagpole uses a pulley. (a) True (b) False
33. 33.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
34. 34.🛟 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
35. 35.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
36. 36.⚖️ 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?
37. 37.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a battery cell (d) a flat table
38. 38.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a balloon (d) a flat table
39. 39.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
40. 40.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) bend it till it snaps (d) stand on the ruler

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