Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 625 · 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: a doorknob is a wheel and axle. (a) True (b) False
2. 2.⚖️ 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
3. 3.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) yeast (c) a round pencil (d) a 30 cm ruler
4. 4.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
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.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
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) turmeric powder (d) a flat table
8. 8.⚙️ Which simple machine is a crowbar? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “distance from the pencil”? (a) we measure it (b) we keep it the same (c) we change it
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) yeast (d) a 30 cm ruler
11. 11.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
13. 13.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) stand on the ruler (d) press it gently
14. 14.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
15. 15.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
16. 16.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) True (b) False
17. 17.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a balloon (c) a mirror (d) a magnet
18. 18.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they may swallow them (d) they are magnetic
19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a mirror (c) a 30 cm ruler (d) a flat table
20. 20.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) neither, it balances (c) the left side (d) the right side
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 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?
22. 22.⚖️ 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
23. 23.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a see-saw (c) a sloping road (d) a flagpole
24. 24.⚙️ Which of these is a lever? (a) a steering wheel (b) a doorknob (c) a tap handle (d) a spoon lifting a lid
25. 25.True or false: a ramp is an inclined plane. (a) False (b) True
26. 26.🧺 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 round pencil (d) a balloon
27. 27.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
28. 28.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) coins of one kind (c) a 30 cm ruler (d) a flat table
29. 29.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a magnet (c) a round pencil (d) turmeric powder
30. 30.True or false: a crowbar is a lever. (a) True (b) False
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) the same ruler (b) the number of coins (c) distance from the pencil (d) where the pencil is
32. 32.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) turmeric powder (d) a 30 cm ruler
33. 33.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
34. 34.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a balloon (c) a flat table (d) turmeric powder
35. 35.True or false: a crane is a wheel and axle. (a) False (b) True
36. 36.⚖️ 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
37. 37.⚙️ Which of these uses a pulley? (a) a crowbar (b) a ramp (c) a steering wheel (d) a well pulley
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) True (b) False
39. 39.True or false: a sloping road uses a pulley. (a) True (b) False
40. 40.⚖️ 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) which side goes down (c) the kind of coins (d) distance from the pencil

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