Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 324 · 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.⚙️ Which of these uses a pulley? (a) a slide (b) a see-saw (c) a well pulley (d) a steering wheel
2. 2.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
3. 3.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) always 10 (d) bigger on the left
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 measure it (b) we change 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? What do we do with “the number of coins”? (a) we change it (b) we measure it (c) we keep it the same
6. 6.🛟 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
7. 7.🧺 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) yeast
8. 8.⚖️ 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 kind of coins (b) which side goes down (c) the number of coins (d) the same ruler
9. 9.True or false: a crowbar is a wheel and axle. (a) False (b) True
10. 10.🧺 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 magnet (d) a round pencil
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) turmeric powder (d) coins of one kind
12. 12.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) False (b) True
13. 13.True or false: a magnet is needed for the ruler lever. (a) True (b) False
14. 14.True or false: a tap handle is a wheel and axle. (a) False (b) True
15. 15.⚙️ Which of these is a lever? (a) a slide (b) a see-saw (c) a well pulley (d) a crane
16. 16.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
17. 17.🔮 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 left side (d) the right side
18. 18.⚖️ 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
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
20. 20.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) impossible (d) harder
21. 21.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
22. 22.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a battery cell (c) a magnet (d) a flat table
23. 23.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
24. 24.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
26. 26.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a battery cell (d) a 30 cm ruler
28. 28.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
29. 29.🧺 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 mirror (d) coins of one kind
30. 30.⚖️ 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 kind of coins (c) distance from the pencil (d) which side goes down
31. 31.⚙️ Which simple machine is a crowbar? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
32. 32.⚖️ 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
33. 33.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a 30 cm ruler (c) a round pencil (d) a flat table
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a 30 cm ruler (c) coins of one kind (d) a flat table
35. 35.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
36. 36.⚙️ Which of these is a wheel and axle? (a) a slide (b) a crowbar (c) a steering wheel (d) a bottle opener
37. 37.⚖️ 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?
38. 38.True or false: a slide is a wheel and axle. (a) True (b) False
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
40. 40.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False

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