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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 11 · 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 yeast for the ruler lever? (a) needed (b) not needed
  2. 2.⚙️ Which simple machine is a steering wheel? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
  3. 3.⚖️ 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 change it (c) we keep it the same
  4. 4.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
  5. 5.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) a balloon (d) yeast
  6. 6.⚖️ 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 change it (c) we measure it
  7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) False (b) True
  8. 8.⚖️ 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?
  9. 9.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
  10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a magnet (d) a flat table
  11. 11.⚖️ 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?
  12. 12.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  13. 13.⚖️ 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) where the pencil is (c) which side goes down
  14. 14.True or false: a steering wheel is an inclined plane. (a) False (b) True
  15. 15.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  16. 16.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) jump up and down (d) sit closer to middle
  17. 17.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) the spoon is hot (d) a lever boosts your push
  18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) coins of one kind (d) turmeric powder
  19. 19.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
  20. 20.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
  21. 21.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
  22. 22.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
  23. 23.True or false: a well pulley is a wheel and axle. (a) True (b) False
  24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) yeast (d) a flat table
  25. 25.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) coins of one kind (c) a round pencil (d) a flat table
  26. 26.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a 30 cm ruler (d) a balloon
  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) the kind of coins (b) which side goes down (c) distance from the pencil
  28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a battery cell (d) a 30 cm ruler
  29. 29.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
  30. 30.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) flick coins at faces (d) bend it till it snaps
  31. 31.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 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?
  32. 32.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) turmeric powder
  33. 33.⚖️ 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) False (b) True
  34. 34.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a well pulley (c) a bottle opener (d) a crowbar
  35. 35.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
  36. 36.True or false: a tap handle is an inclined plane. (a) False (b) True
  37. 37.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
  38. 38.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
  39. 39.⚖️ 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?
  40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) False (b) True

Answer key

  1. not needed
  2. a wheel and axle
  3. we keep it the same
  4. True
  5. a 30 cm ruler
  6. we change it
  7. False
  8. 6
  9. easier
  10. a magnet
  11. 8
  12. 8
  13. where the pencil is
  14. False
  15. 2
  16. sit farther from middle
  17. a lever boosts your push
  18. turmeric powder
  19. False
  20. yeast
  21. needed
  22. 2
  23. False
  24. yeast
  25. a mirror
  26. a balloon
  27. the kind of coins
  28. a battery cell
  29. a lever
  30. press it gently
  31. 8
  32. turmeric powder
  33. True
  34. a steering wheel
  35. 5
  36. False
  37. not needed
  38. a lever
  39. 4
  40. False

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