Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 986 · 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.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too shiny (c) they are too cold (d) they are magnetic
2. 2.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
3. 3.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
4. 4.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) zero (d) bigger on the left
5. 5.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) bend it till it snaps (d) flick coins at faces
6. 6.⚙️ Which simple machine is a slide? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
7. 7.True or false: a crane uses a pulley. (a) True (b) False
8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a flat table (c) coins of one kind (d) a 30 cm ruler
9. 9.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a well pulley (c) a doorknob (d) a see-saw
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) False (b) True
11. 11.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a battery cell
12. 12.⚖️ 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
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
14. 14.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
15. 15.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) turmeric powder (c) a balloon (d) a magnet
16. 16.⚖️ 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) which side goes down (c) the number of coins (d) distance from the pencil
17. 17.True or false: a balloon is needed for the ruler lever. (a) False (b) True
18. 18.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
19. 19.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) a 30 cm ruler (c) coins of one kind (d) a flat table
20. 20.🧺 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
21. 21.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
22. 22.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a battery cell
24. 24.⚙️ Which of these uses a pulley? (a) a see-saw (b) a ramp (c) a crane (d) a slide
25. 25.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) harder (d) the same
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 5 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?
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 3 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?
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False
29. 29.True or false: a flagpole is a wheel and axle. (a) False (b) True
30. 30.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) yeast (c) a flat table (d) a 30 cm ruler
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) where the pencil is (b) the number of coins (c) the kind of coins (d) distance from the pencil
32. 32.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
33. 33.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
34. 34.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
35. 35.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
36. 36.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a mirror (d) a 30 cm ruler
37. 37.⚖️ 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?
38. 38.🧺 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 magnet
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
40. 40.True or false: a magnet is needed for the ruler lever. (a) True (b) False

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