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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 407 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.⚖️ 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 keep it the same (c) we change it
  2. 2.🔮 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) the right side (c) the left side (d) neither, it balances
  3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) coins of one kind (c) a round pencil (d) a 30 cm ruler
  4. 4.True or false: a crowbar is a lever. (a) False (b) True
  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 the one thing we change. (a) True (b) False
  6. 6.⚙️ Which simple machine is a well pulley? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
  7. 7.True or false: a tap handle is a wheel and axle. (a) True (b) False
  8. 8.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
  9. 9.🧺 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 balloon
  10. 10.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a doorknob (c) a see-saw (d) a crowbar
  11. 11.⚙️ Which simple machine is a flagpole? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
  12. 12.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) equal on both sides (c) zero (d) bigger on the left
  13. 13.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
  14. 14.⚙️ Which of these is a lever? (a) a crane (b) a sloping road (c) a slide (d) a crowbar
  15. 15.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
  16. 16.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
  17. 17.⚖️ 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 keep it the same (c) we measure it
  18. 18.⚖️ 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) distance from the pencil (c) the number of coins
  19. 19.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a balloon (c) a flat table (d) turmeric powder
  20. 20.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
  21. 21.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
  22. 22.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
  23. 23.True or false: a well pulley uses a pulley. (a) False (b) True
  24. 24.True or false: a spoon lifting a lid is a lever. (a) False (b) True
  25. 25.⚙️ Which of these is a lever? (a) a doorknob (b) a steering wheel (c) a well pulley (d) a bottle opener
  26. 26.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) yeast (d) a mirror
  27. 27.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a bottle opener (c) a sloping road (d) a well pulley
  28. 28.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
  29. 29.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
  30. 30.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) press it gently (d) stand on the ruler
  31. 31.True or false: a ramp is an inclined plane. (a) False (b) True
  32. 32.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a mirror (d) coins of one kind
  33. 33.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a flat table (d) a round pencil
  34. 34.⚖️ 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
  35. 35.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a crowbar (c) a sloping road (d) a doorknob
  36. 36.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
  37. 37.True or false: yeast is needed for the ruler lever. (a) True (b) False
  38. 38.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
  39. 39.True or false: a steering wheel is a wheel and axle. (a) False (b) True
  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 kept the same. (a) False (b) True

Answer key

  1. we keep it the same
  2. the right side
  3. turmeric powder
  4. True
  5. False
  6. a pulley
  7. True
  8. not needed
  9. a balloon
  10. a doorknob
  11. a pulley
  12. equal on both sides
  13. needed
  14. a crowbar
  15. needed
  16. not needed
  17. we keep it the same
  18. the number of coins
  19. a flat table
  20. True
  21. not needed
  22. easier
  23. True
  24. True
  25. a bottle opener
  26. coins of one kind
  27. a well pulley
  28. not needed
  29. not needed
  30. press it gently
  31. True
  32. a mirror
  33. a balloon
  34. we change it
  35. a sloping road
  36. the fulcrum
  37. False
  38. True
  39. True
  40. True

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