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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 762 · 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.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) False (b) True
  2. 2.⚖️ 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) where the pencil is (c) distance from the pencil
  3. 3.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 5 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
  4. 4.⚖️ 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) the kind of coins
  5. 5.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they are magnetic (d) they may swallow them
  6. 6.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
  7. 7.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) yeast (c) a 30 cm ruler (d) coins of one kind
  8. 8.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) jump up and down (d) sit closer to middle
  9. 9.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 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?
  10. 10.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
  11. 11.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
  12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a magnet (c) a 30 cm ruler (d) coins of one kind
  13. 13.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
  14. 14.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  15. 15.🧺 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 flat table (d) a balloon
  16. 16.True or false: a spoon lifting a lid is an inclined plane. (a) True (b) False
  17. 17.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
  18. 18.⚖️ 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
  19. 19.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the right side (c) both go up (d) the left side
  20. 20.⚖️ 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 change it (b) we measure it (c) we keep it the same
  21. 21.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a magnet (c) a flat table (d) a 30 cm ruler
  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) distance from the pencil (b) which side goes down (c) the number of coins (d) the kind of coins
  23. 23.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) stand on the ruler (d) press it gently
  24. 24.True or false: a tap handle is a wheel and axle. (a) False (b) True
  25. 25.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
  26. 26.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) a mirror
  27. 27.⚖️ 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
  28. 28.True or false: yeast is needed for the ruler lever. (a) False (b) True
  29. 29.⚖️ 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
  30. 30.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) a lever boosts your push (d) the spoon is magnetic
  31. 31.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
  32. 32.⚖️ 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 number of coins (c) distance from the pencil
  33. 33.⚖️ 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?
  34. 34.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
  35. 35.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a 30 cm ruler (c) a mirror (d) yeast
  36. 36.🧺 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 30 cm ruler (d) a battery cell
  37. 37.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
  38. 38.⚙️ Which simple machine is a crane? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
  39. 39.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a balloon (c) coins of one kind (d) a magnet
  40. 40.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) turmeric powder (c) coins of one kind (d) a flat table

Answer key

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

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