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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 707 · 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.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) a magnet (d) a 30 cm ruler
  2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a mirror (d) coins of one kind
  3. 3.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) jump up and down (d) sit farther from middle
  4. 4.⚖️ 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 number of coins (c) which side goes down (d) distance from the pencil
  5. 5.⚖️ 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) distance from the pencil (c) the same ruler (d) where the pencil is
  6. 6.⚖️ 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
  7. 7.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
  8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) coins of one kind (c) a round pencil (d) a flat table
  9. 9.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 6 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
  10. 10.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible
  11. 11.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
  12. 12.⚙️ Which simple machine is a sloping road? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
  13. 13.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) turmeric powder (d) a round pencil
  14. 14.🔮 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) neither, it balances (c) the left side (d) the right side
  15. 15.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
  16. 16.True or false: a crane is a wheel and axle. (a) False (b) True
  17. 17.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
  18. 18.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
  19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a round pencil (d) a battery cell
  20. 20.⚖️ 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) False (b) True
  21. 21.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) equal on both sides (d) bigger on the left
  22. 22.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) True (b) False
  23. 23.⚙️ Which simple machine is a flagpole? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
  24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) True (b) False
  25. 25.⚖️ 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 change it (b) we measure it (c) we keep it the same
  26. 26.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a ramp (c) a spoon lifting a lid (d) a see-saw
  27. 27.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a balloon (c) a 30 cm ruler (d) coins of one kind
  28. 28.⚙️ Which simple machine is a well pulley? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
  29. 29.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
  30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) True (b) False
  31. 31.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a balloon (c) yeast (d) a flat table
  32. 32.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a round pencil (d) a magnet
  33. 33.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
  34. 34.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
  35. 35.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too shiny (c) they are magnetic (d) they are too cold
  36. 36.⚖️ 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
  37. 37.⚖️ 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
  38. 38.⚖️ 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) False (b) True
  39. 39.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
  40. 40.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?

Answer key

  1. a magnet
  2. a mirror
  3. sit farther from middle
  4. which side goes down
  5. distance from the pencil
  6. we keep it the same
  7. True
  8. a balloon
  9. 3
  10. easier
  11. True
  12. an inclined plane
  13. turmeric powder
  14. the right side
  15. False
  16. False
  17. needed
  18. not needed
  19. a battery cell
  20. True
  21. equal on both sides
  22. False
  23. a pulley
  24. True
  25. we keep it the same
  26. a ramp
  27. a balloon
  28. a pulley
  29. 2
  30. False
  31. a flat table
  32. a magnet
  33. not needed
  34. True
  35. they may swallow them
  36. True
  37. we change it
  38. False
  39. the fulcrum
  40. 1

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