Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 68 · 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? Which of these is the one thing we change? (a) the kind of coins (b) distance from the pencil (c) which side goes down (d) where the pencil is
2. 2.⚖️ 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 measure it (b) we change it (c) we keep it the same
3. 3.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) the same (d) easier
4. 4.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they are too cold (d) they may swallow them
5. 5.⚖️ 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
6. 6.True or false: a flat table is needed for the ruler lever. (a) False (b) True
7. 7.True or false: a bottle opener is a lever. (a) True (b) False
8. 8.🧺 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) a balloon
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a magnet (c) coins of one kind (d) a round pencil
10. 10.⚙️ Which of these uses a pulley? (a) a ramp (b) a crowbar (c) a well pulley (d) a steering wheel
11. 11.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
12. 12.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
14. 14.True or false: a crowbar is an inclined plane. (a) False (b) True
15. 15.⚙️ Which simple machine is a flagpole? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
16. 16.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) coins of one kind (c) a flat table (d) a round pencil
17. 17.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
18. 18.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) flick coins at faces (d) press it gently
19. 19.⚖️ 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 measure it (b) we change it (c) we keep it the same
20. 20.True or false: a ramp is an inclined plane. (a) False (b) True
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a round pencil (d) a battery cell
22. 22.True or false: a crowbar is a lever. (a) False (b) True
23. 23.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
24. 24.⚖️ 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 keep it the same (b) we measure it (c) we change it
25. 25.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a doorknob (c) a crowbar (d) a crane
26. 26.⚖️ 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 measure it (b) we change it (c) we keep it the same
27. 27.⚖️ 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
28. 28.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
29. 29.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a crowbar (c) a sloping road (d) a well pulley
30. 30.⚙️ Which simple machine is a see-saw? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) coins of one kind (c) a 30 cm ruler (d) a flat table
32. 32.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
33. 33.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
34. 34.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a magnet (c) a battery cell (d) coins of one kind
35. 35.⚙️ Which simple machine is a crane? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
36. 36.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
37. 37.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
38. 38.⚖️ 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) False (b) True
39. 39.⚙️ Which of these is a lever? (a) a flagpole (b) a steering wheel (c) a bottle opener (d) a ramp
40. 40.⚖️ 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) True (b) False

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