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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 817 · 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.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a round pencil (d) a balloon
  2. 2.🛟 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
  3. 3.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a magnet (d) coins of one kind
  4. 4.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
  5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) a magnet
  6. 6.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
  7. 7.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
  8. 8.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
  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 keep it the same (b) we measure it (c) we change it
  10. 10.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) always 10 (d) equal on both sides
  11. 11.🔮 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) neither, it balances (c) the right side (d) both go up
  12. 12.⚙️ Which of these is a lever? (a) a slide (b) a crowbar (c) a sloping road (d) a well pulley
  13. 13.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
  14. 14.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
  15. 15.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a crane (c) a doorknob (d) a ramp
  16. 16.True or false: a mirror is needed for the ruler lever. (a) True (b) False
  17. 17.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
  18. 18.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
  19. 19.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) impossible (d) harder
  20. 20.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) a flat table (c) coins of one kind (d) a 30 cm ruler
  21. 21.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
  22. 22.⚖️ 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?
  23. 23.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
  24. 24.True or false: a crowbar is a wheel and axle. (a) False (b) True
  25. 25.⚖️ 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
  26. 26.⚖️ 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
  27. 27.⚖️ 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) where the pencil is
  28. 28.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
  29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a round pencil (c) a 30 cm ruler (d) a flat table
  30. 30.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 12 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
  31. 31.True or false: a crowbar 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) coins of one kind (b) turmeric powder (c) a 30 cm ruler (d) a flat table
  33. 33.⚖️ 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
  34. 34.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a battery cell (c) coins of one kind (d) a flat table
  35. 35.⚖️ 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 kind of coins (d) distance from the pencil
  36. 36.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  37. 37.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a magnet (c) yeast (d) a balloon
  38. 38.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
  39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (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) which side goes down (b) distance from the pencil (c) the same ruler (d) the number of coins

Answer key

  1. a balloon
  2. press it gently
  3. coins of one kind
  4. not needed
  5. a magnet
  6. needed
  7. not needed
  8. False
  9. we change it
  10. equal on both sides
  11. the right side
  12. a crowbar
  13. 6
  14. a magnet
  15. a ramp
  16. False
  17. not needed
  18. True
  19. easier
  20. turmeric powder
  21. True
  22. 2
  23. 5
  24. False
  25. we measure it
  26. we keep it the same
  27. where the pencil is
  28. 6
  29. a battery cell
  30. 6
  31. False
  32. turmeric powder
  33. True
  34. a battery cell
  35. distance from the pencil
  36. 8
  37. a round pencil
  38. a wheel and axle
  39. True
  40. which side goes down

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