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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 969 · 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.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) harder (d) easier
  2. 2.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 3 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?
  3. 3.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a round pencil (d) a battery cell
  4. 4.⚖️ 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) False (b) True
  5. 5.True or false: a slide is a wheel and axle. (a) True (b) False
  6. 6.🧺 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 battery cell (d) a 30 cm ruler
  7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we keep it the same (b) we change it (c) we measure it
  8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a balloon (d) a 30 cm ruler
  9. 9.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the spoon is magnetic (c) the lid gets softer (d) the spoon is hot
  10. 10.⚖️ 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
  11. 11.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 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?
  12. 12.⚖️ 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) the same ruler (c) distance from the pencil
  13. 13.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) press it gently (d) stand on the ruler
  14. 14.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
  15. 15.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a doorknob (c) a spoon lifting a lid (d) a see-saw
  16. 16.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
  17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a mirror (d) a round pencil
  18. 18.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
  19. 19.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  20. 20.True or false: yeast is not needed for the ruler lever. (a) False (b) True
  21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a flat table (c) a 30 cm ruler (d) a round pencil
  22. 22.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) distance from the pencil (c) the number of coins (d) which side goes down
  23. 23.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 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?
  24. 24.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
  25. 25.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a mirror (c) a flat table (d) coins of one kind
  26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a magnet (d) a 30 cm ruler
  27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) False (b) True
  28. 28.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a battery cell (c) a mirror (d) a 30 cm ruler
  29. 29.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a balloon (c) a battery cell (d) coins of one kind
  30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
  31. 31.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a bottle opener (c) a see-saw (d) a ramp
  32. 32.True or false: yeast is needed for the ruler lever. (a) False (b) True
  33. 33.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
  34. 34.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a balloon (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 kept the same? (a) distance from the pencil (b) which side goes down (c) where the pencil is
  36. 36.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  37. 37.⚖️ 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 keep it the same (b) we measure it (c) we change it
  38. 38.⚙️ Which of these is a lever? (a) a crane (b) a ramp (c) a bottle opener (d) a flagpole
  39. 39.⚖️ 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 5 cm to the right to balance it?
  40. 40.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit closer to middle (c) sit on the middle (d) sit farther from middle

Answer key

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

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