Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 523 · 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: turmeric powder is needed for the ruler lever. (a) True (b) False
2. 2.⚖️ 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?
3. 3.⚙️ Which simple machine is a well pulley? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
4. 4.⚖️ 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 number of coins (b) where the pencil is (c) which side goes down (d) the same ruler
5. 5.True or false: a mirror is needed for the ruler lever. (a) True (b) False
6. 6.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the load (d) the fulcrum
7. 7.⚖️ 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) distance from the pencil (c) the number of coins (d) which side goes down
8. 8.⚙️ Which simple machine is a crane? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) turmeric powder (d) a 30 cm ruler
10. 10.⚖️ 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
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
12. 12.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) the same (d) impossible
13. 13.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
14. 14.⚖️ 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) False (b) True
15. 15.True or false: a flagpole is an inclined plane. (a) False (b) True
16. 16.⚙️ Which of these is a lever? (a) a ramp (b) a sloping road (c) a see-saw (d) a well pulley
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) coins of one kind (c) a 30 cm ruler (d) a flat table
18. 18.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) flick coins at faces (d) stand on the ruler
19. 19.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) turmeric powder (d) a flat table
20. 20.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
21. 21.⚖️ 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 measure it (c) we keep it the same
22. 22.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
23. 23.⚙️ Which of these is an inclined plane? (a) a crane (b) a ramp (c) a tap handle (d) a see-saw
24. 24.🔮 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) the right side (c) neither, it balances (d) both go up
25. 25.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a steering wheel (c) a bottle opener (d) a crane
26. 26.True or false: yeast is not needed for the ruler lever. (a) False (b) True
27. 27.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a balloon (c) turmeric powder (d) a round pencil
28. 28.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
29. 29.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a mirror (c) coins of one kind (d) a flat table
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) the number of coins (c) distance from the pencil
31. 31.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) equal on both sides (d) zero
32. 32.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) distance from the pencil (c) the same ruler
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) coins of one kind (c) a 30 cm ruler (d) a flat table
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
35. 35.True or false: a doorknob uses a pulley. (a) True (b) False
36. 36.⚖️ 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
37. 37.⚖️ 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
38. 38.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
39. 39.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
40. 40.True or false: a tap handle is an inclined plane. (a) False (b) True

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