Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 809 · 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.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a round pencil (d) a balloon
2. 2.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) True (b) False
3. 3.⚖️ 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?
4. 4.⚖️ 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 change it (b) we measure it (c) we keep it the same
5. 5.⚖️ 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 same ruler (c) the kind of coins (d) the number of coins
6. 6.⚖️ 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 measure it (c) we change it
7. 7.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
8. 8.⚖️ 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 6 cm to the right to balance it?
9. 9.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
10. 10.⚖️ 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) True (b) False
11. 11.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
12. 12.⚙️ Which of these is a lever? (a) a tap handle (b) a slide (c) a spoon lifting a lid (d) a sloping road
13. 13.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) the left side (c) neither, it balances (d) the right side
14. 14.True or false: a tap handle is an inclined plane. (a) True (b) False
15. 15.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
16. 16.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are too cold (d) they are magnetic
17. 17.⚙️ Which of these uses a pulley? (a) a see-saw (b) a doorknob (c) a steering wheel (d) a crane
18. 18.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
19. 19.⚖️ 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?
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a battery cell (c) a 30 cm ruler (d) a round pencil
21. 21.True or false: a crane uses a pulley. (a) False (b) True
22. 22.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a mirror
23. 23.⚙️ Which of these is an inclined plane? (a) a sloping road (b) a well pulley (c) a bottle opener (d) a crowbar
24. 24.⚙️ Which of these uses a pulley? (a) a tap handle (b) a doorknob (c) a steering wheel (d) a well pulley
25. 25.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit closer to middle (c) sit farther from middle (d) sit on the middle
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
27. 27.True or false: a doorknob is an inclined plane. (a) True (b) False
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
29. 29.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a magnet (c) yeast (d) a flat table
30. 30.⚙️ Which simple machine is a well pulley? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
31. 31.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
32. 32.⚖️ 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 change it (b) we measure it (c) we keep it the same
33. 33.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) stand on the ruler (d) press it gently
34. 34.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
35. 35.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 8 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) yeast (c) a round pencil (d) coins of one kind
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
39. 39.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a balloon (d) a battery cell
40. 40.True or false: a mirror is not needed for the ruler lever. (a) False (b) True

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