Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 151 · 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: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) the same (d) impossible
2. 2.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
4. 4.🧺 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 round pencil
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) False (b) True
6. 6.⚙️ Which of these uses a pulley? (a) a doorknob (b) a steering wheel (c) a crane (d) a tap handle
7. 7.🔮 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
8. 8.⚙️ Which simple machine is a sloping road? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
9. 9.⚙️ Which of these is a lever? (a) a slide (b) a spoon lifting a lid (c) a ramp (d) a doorknob
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a battery cell (c) a round pencil (d) coins of one kind
11. 11.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit closer to middle (c) sit on the middle (d) sit farther from middle
12. 12.⚖️ 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) which side goes down (b) the number of coins (c) the same ruler (d) distance from the pencil
13. 13.True or false: yeast is not needed for the ruler lever. (a) True (b) False
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
15. 15.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
16. 16.⚖️ 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
17. 17.⚖️ 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) True (b) False
18. 18.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a mirror (c) a round pencil (d) turmeric powder
19. 19.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a magnet (d) a round pencil
20. 20.True or false: a doorknob uses a pulley. (a) True (b) False
21. 21.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) the same ruler (c) which side goes down
22. 22.⚖️ 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 change it (c) we keep it the same
23. 23.⚖️ 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 keep it the same (b) we change it (c) we measure it
24. 24.⚖️ 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 keep it the same (b) we measure it (c) we change it
25. 25.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a balloon (c) a 30 cm ruler (d) a magnet
26. 26.True or false: a sloping road is an inclined plane. (a) False (b) True
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
28. 28.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
29. 29.⚙️ Which simple machine is a slide? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
30. 30.⚙️ Which of these is a lever? (a) a flagpole (b) a crowbar (c) a slide (d) a ramp
31. 31.True or false: a bottle opener uses a pulley. (a) True (b) False
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
33. 33.True or false: a crane is a lever. (a) False (b) True
34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) the same ruler (c) where the pencil is (d) which side goes down
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a magnet (c) a 30 cm ruler (d) a round pencil
36. 36.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
37. 37.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a flat table (d) yeast
38. 38.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
39. 39.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a flat table (d) a mirror
40. 40.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too cold (d) they are too shiny

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