Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 998 · 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.🔮 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) both go up (c) the right side (d) neither, it balances
2. 2.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
3. 3.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
4. 4.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 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?
6. 6.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
7. 7.🧺 Which of these is needed for the ruler lever? (a) yeast (b) coins of one kind (c) turmeric powder (d) a balloon
8. 8.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
9. 9.⚖️ 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 kind of coins (c) distance from the pencil
10. 10.True or false: yeast is needed for the ruler lever. (a) False (b) True
11. 11.True or false: a balloon is needed for the ruler lever. (a) False (b) True
12. 12.True or false: a doorknob is a wheel and axle. (a) False (b) True
13. 13.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
14. 14.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
15. 15.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit on the middle (d) sit closer to middle
16. 16.True or false: a steering wheel is a wheel and axle. (a) False (b) True
17. 17.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) coins of one kind (c) a flat table (d) a round pencil
19. 19.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a 30 cm ruler (c) a battery cell (d) turmeric powder
20. 20.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
21. 21.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a 30 cm ruler (c) a flat table (d) coins of one kind
22. 22.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 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?
24. 24.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
25. 25.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
26. 26.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
27. 27.⚖️ 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) True (b) False
28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a flat table (d) turmeric powder
29. 29.True or false: a doorknob uses a pulley. (a) True (b) False
30. 30.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
31. 31.True or false: a crane uses a pulley. (a) False (b) True
32. 32.⚙️ Which simple machine is a crane? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
33. 33.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a magnet (c) a round pencil (d) a 30 cm ruler
35. 35.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they are too shiny (d) they may swallow them
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
37. 37.⚖️ 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
38. 38.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
39. 39.True or false: a spoon lifting a lid uses a pulley. (a) True (b) False
40. 40.🧺 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) coins of one kind

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