Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 129 · 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? What do we do with “the kind of coins”? (a) we change it (b) we keep it the same (c) we measure it
2. 2.⚖️ 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?
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
4. 4.🔮 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 right side (d) the left side
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) the kind of coins (b) the number of coins (c) distance from the pencil (d) the same ruler
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 change it (b) we keep it the same (c) we measure it
7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) harder (d) the same
8. 8.⚙️ Which of these uses a pulley? (a) a flagpole (b) a see-saw (c) a crowbar (d) a tap handle
9. 9.True or false: a well pulley uses a pulley. (a) False (b) True
10. 10.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a mirror (c) a round pencil (d) a 30 cm ruler
11. 11.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
12. 12.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a balloon (c) yeast (d) a magnet
13. 13.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) equal on both sides (d) always 10
14. 14.⚖️ 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 keep it the same (b) we measure it (c) we change it
15. 15.⚖️ 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
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 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?
17. 17.🛟 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
18. 18.⚖️ 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 keep it the same (b) we measure it (c) we change it
19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) a battery cell
20. 20.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
21. 21.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) turmeric powder (c) a balloon (d) a battery cell
22. 22.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a balloon (c) a round pencil (d) coins of one kind
24. 24.⚖️ 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?
25. 25.⚖️ 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
26. 26.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
27. 27.True or false: a slide is an inclined plane. (a) False (b) True
28. 28.True or false: a flagpole is a lever. (a) False (b) True
29. 29.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they are too shiny (d) they may swallow them
30. 30.⚖️ 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) distance from the pencil (d) which side goes down
31. 31.⚙️ Which of these is a lever? (a) a crane (b) a flagpole (c) a well pulley (d) a see-saw
32. 32.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
33. 33.True or false: a flagpole uses a pulley. (a) True (b) False
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 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?
35. 35.⚙️ Which simple machine is a ramp? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
36. 36.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a crane (c) a spoon lifting a lid (d) a slide
37. 37.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
39. 39.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
40. 40.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a 30 cm ruler (c) coins of one kind (d) a round pencil

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