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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 660 · 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.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
  2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a mirror (c) coins of one kind (d) a round pencil
  3. 3.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
  4. 4.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a steering wheel (c) a tap handle (d) a flagpole
  5. 5.⚖️ 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
  6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
  7. 7.🧺 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 flat table
  8. 8.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) press it gently (d) bend it till it snaps
  9. 9.⚖️ 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 change it (b) we measure it (c) we keep it the same
  10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a flat table (c) a round pencil (d) coins of one kind
  11. 11.⚙️ Which of these is a lever? (a) a bottle opener (b) a tap handle (c) a sloping road (d) a ramp
  12. 12.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
  13. 13.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) a 30 cm ruler (c) a round pencil (d) coins of one kind
  14. 14.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a round pencil (d) a balloon
  15. 15.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
  16. 16.⚖️ 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) which side goes down (c) the same ruler (d) distance from the pencil
  17. 17.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) always 10 (d) zero
  18. 18.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
  19. 19.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
  20. 20.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
  21. 21.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
  22. 22.True or false: a bottle opener is a wheel and axle. (a) True (b) False
  23. 23.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 3 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
  24. 24.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
  25. 25.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  26. 26.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit farther from middle (d) sit on the middle
  27. 27.⚖️ 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) distance from the pencil (b) the number of coins (c) the kind of coins (d) where the pencil is
  28. 28.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
  29. 29.⚖️ 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) False (b) True
  30. 30.⚙️ Which of these uses a pulley? (a) a crowbar (b) a well pulley (c) a spoon lifting a lid (d) a see-saw
  31. 31.⚖️ 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?
  32. 32.⚖️ 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 keep it the same (b) we change it (c) we measure it
  33. 33.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) the same (d) impossible
  34. 34.True or false: yeast is needed for the ruler lever. (a) False (b) True
  35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a magnet (c) coins of one kind (d) a 30 cm ruler
  36. 36.⚖️ 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 measure it (c) we change it
  37. 37.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a flat table (c) a mirror (d) a magnet
  38. 38.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
  39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) True (b) False
  40. 40.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever

Answer key

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

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