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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 848 · 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? What do we do with “the kind of coins”? (a) we measure it (b) we change it (c) we keep it the same
  2. 2.⚖️ 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) True (b) False
  3. 3.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
  4. 4.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
  5. 5.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they may swallow them (d) they are magnetic
  6. 6.⚖️ 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 number of coins (b) which side goes down (c) distance from the pencil (d) the kind of coins
  7. 7.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
  8. 8.⚖️ 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 measure it (b) we keep it the same (c) we change it
  9. 9.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a magnet (c) coins of one kind (d) a 30 cm ruler
  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 the one thing we change. (a) False (b) True
  11. 11.⚖️ 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?
  12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) turmeric powder (d) a 30 cm ruler
  13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a magnet (c) a round pencil (d) a flat table
  14. 14.True or false: a bottle opener is a wheel and axle. (a) False (b) True
  15. 15.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) stand on the ruler (d) bend it till it snaps
  16. 16.🧺 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) yeast
  17. 17.⚖️ 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
  18. 18.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
  19. 19.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
  20. 20.⚙️ Which simple machine is a flagpole? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
  21. 21.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
  22. 22.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
  23. 23.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the left side (b) both go up (c) neither, it balances (d) the right side
  24. 24.True or false: a spoon lifting a lid is a lever. (a) False (b) True
  25. 25.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a balloon (c) yeast (d) a battery cell
  26. 26.⚙️ Which of these uses a pulley? (a) a see-saw (b) a sloping road (c) a flagpole (d) a bottle opener
  27. 27.⚙️ Which of these is a lever? (a) a tap handle (b) a spoon lifting a lid (c) a flagpole (d) a sloping road
  28. 28.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) turmeric powder (c) a battery cell (d) a balloon
  29. 29.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a mirror (c) a flat table (d) a round pencil
  30. 30.True or false: a balloon is needed for the ruler lever. (a) False (b) True
  31. 31.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
  32. 32.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a battery cell (c) a 30 cm ruler (d) a round pencil
  33. 33.⚖️ 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?
  34. 34.⚖️ 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 measure it (b) we keep it the same (c) we change it
  35. 35.⚖️ 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
  36. 36.True or false: a doorknob is a lever. (a) False (b) True
  37. 37.⚖️ 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
  38. 38.⚖️ 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
  39. 39.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 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?
  40. 40.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True

Answer key

  1. we keep it the same
  2. True
  3. 4
  4. needed
  5. they may swallow them
  6. which side goes down
  7. the fulcrum
  8. we measure it
  9. a magnet
  10. False
  11. 6
  12. turmeric powder
  13. a magnet
  14. False
  15. press it gently
  16. yeast
  17. we keep it the same
  18. easier
  19. a wheel and axle
  20. a pulley
  21. 2
  22. 1
  23. the right side
  24. True
  25. a round pencil
  26. a flagpole
  27. a spoon lifting a lid
  28. a 30 cm ruler
  29. a mirror
  30. False
  31. False
  32. a battery cell
  33. 2
  34. we keep it the same
  35. False
  36. False
  37. True
  38. True
  39. 6
  40. False

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