Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 164 · 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? What do we do with “the number of coins”? (a) we measure it (b) we keep it the same (c) we change it
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible
3. 3.⚙️ Which of these uses a pulley? (a) a bottle opener (b) a doorknob (c) a slide (d) a flagpole
4. 4.⚖️ 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) which side goes down (c) where the pencil is
5. 5.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) bigger on the left (d) equal on both sides
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 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?
7. 7.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a balloon (c) a mirror (d) turmeric powder
8. 8.🛟 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
9. 9.⚖️ 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
10. 10.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a balloon (c) a flat table (d) a magnet
11. 11.🧺 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 30 cm ruler (d) a balloon
12. 12.⚖️ 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 measure it (b) we change it (c) we keep it the same
13. 13.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
14. 14.True or false: a flagpole uses a pulley. (a) False (b) True
15. 15.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit on the middle (c) sit farther from middle (d) sit closer to middle
16. 16.True or false: a tap handle is a wheel and axle. (a) True (b) False
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a round pencil (c) a 30 cm ruler (d) coins of one kind
18. 18.⚖️ 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) the same ruler (c) which side goes down (d) where the pencil is
19. 19.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
20. 20.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
21. 21.⚖️ 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
22. 22.True or false: a tap handle uses a pulley. (a) True (b) False
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
24. 24.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
25. 25.⚖️ 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) True (b) False
26. 26.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
27. 27.🔮 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) the left side (c) both go up (d) the right side
28. 28.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 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?
31. 31.⚙️ Which of these is a lever? (a) a doorknob (b) a flagpole (c) a ramp (d) a bottle opener
32. 32.⚖️ 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) True (b) False
33. 33.True or false: a balloon is not 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) yeast (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
35. 35.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
36. 36.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
37. 37.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a bottle opener (c) a spoon lifting a lid (d) a flagpole
38. 38.True or false: a crowbar is a lever. (a) True (b) False
39. 39.⚖️ 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) the same ruler (c) the number of coins (d) distance from the pencil
40. 40.True or false: a well pulley uses a pulley. (a) False (b) True

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