Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 190 · 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.True or false: yeast is not needed for the ruler lever. (a) True (b) False
2. 2.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
3. 3.⚖️ 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 change it (b) we keep it the same (c) we measure it
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) False (b) True
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 number of coins (b) the same ruler (c) distance from the pencil (d) where the pencil is
6. 6.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) jump up and down (d) sit farther from middle
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
8. 8.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
9. 9.⚙️ Which simple machine is a bottle opener? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
10. 10.⚙️ Which of these is a lever? (a) a tap handle (b) a well pulley (c) a crane (d) a bottle opener
11. 11.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a balloon (d) a 30 cm ruler
12. 12.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
13. 13.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
14. 14.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a balloon (c) a flat table (d) a 30 cm ruler
15. 15.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) coins of one kind (c) a battery cell (d) yeast
16. 16.⚙️ Which of these uses a pulley? (a) a tap handle (b) a slide (c) a spoon lifting a lid (d) a crane
17. 17.⚖️ 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 keep it the same (b) we change it (c) we measure it
18. 18.🔮 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) neither, it balances (c) the right side (d) both go up
19. 19.True or false: a crane uses a pulley. (a) True (b) False
20. 20.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
21. 21.⚖️ 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) True (b) False
22. 22.⚖️ 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
23. 23.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) which side goes down (c) the number of coins (d) the same ruler
25. 25.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
26. 26.⚖️ 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 measure it (b) we keep it the same (c) we change it
27. 27.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a battery cell (d) a round pencil
28. 28.True or false: yeast is needed for the ruler lever. (a) False (b) True
29. 29.⚖️ 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?
30. 30.⚖️ 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) False (b) True
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) yeast (c) a round pencil (d) a flat table
32. 32.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) zero (c) bigger on the left (d) always 10
33. 33.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
34. 34.True or false: a well pulley is a lever. (a) True (b) False
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) turmeric powder (c) coins of one kind (d) a flat table
36. 36.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
37. 37.⚙️ Which simple machine is a sloping road? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
38. 38.⚖️ 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?
39. 39.True or false: a magnet is needed for the ruler lever. (a) False (b) True
40. 40.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps

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