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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 775 · 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.⚙️ Which of these is a lever? (a) a doorknob (b) a slide (c) a well pulley (d) a bottle opener
  2. 2.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
  3. 3.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) turmeric powder (c) a 30 cm ruler (d) a flat table
  5. 5.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) impossible (d) harder
  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 kind of coins (b) which side goes down (c) distance from the pencil (d) the number of coins
  7. 7.⚙️ Which simple machine is a crane? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
  8. 8.True or false: a ramp is an inclined plane. (a) True (b) False
  9. 9.⚖️ 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) False (b) True
  10. 10.⚖️ 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) the number of coins (b) which side goes down (c) distance from the pencil (d) the kind of coins
  11. 11.⚖️ 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
  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) the same ruler (b) which side goes down (c) distance from the pencil
  13. 13.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
  14. 14.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 1 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
  15. 15.🔮 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 right side (b) the left side (c) both go up (d) neither, it balances
  16. 16.True or false: a bottle opener uses a pulley. (a) True (b) False
  17. 17.True or false: a flagpole uses a pulley. (a) False (b) True
  18. 18.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
  19. 19.⚖️ 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 number of coins (b) which side goes down (c) distance from the pencil
  20. 20.⚙️ Which of these uses a pulley? (a) a crane (b) a crowbar (c) a see-saw (d) a ramp
  21. 21.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
  22. 22.True or false: a crane is a wheel and axle. (a) True (b) False
  23. 23.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a mirror (d) coins of one kind
  24. 24.🧺 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
  25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a mirror (d) coins of one kind
  26. 26.⚖️ 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
  27. 27.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
  28. 28.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
  29. 29.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  30. 30.True or false: a well pulley uses a pulley. (a) False (b) True
  31. 31.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 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? True or false: which side goes down is the one thing we change. (a) True (b) False
  33. 33.⚖️ 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
  34. 34.🧺 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) yeast
  35. 35.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) bend it till it snaps (d) flick coins at faces
  36. 36.⚖️ 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
  37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) True (b) False
  38. 38.⚖️ 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
  39. 39.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
  40. 40.⚖️ 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 measure it (c) we change it

Answer key

  1. a bottle opener
  2. not needed
  3. 4
  4. turmeric powder
  5. easier
  6. which side goes down
  7. a pulley
  8. True
  9. False
  10. distance from the pencil
  11. False
  12. the same ruler
  13. 5
  14. 1
  15. the right side
  16. False
  17. True
  18. not needed
  19. the number of coins
  20. a crane
  21. not needed
  22. False
  23. a mirror
  24. a magnet
  25. a mirror
  26. True
  27. False
  28. not needed
  29. 4
  30. True
  31. 1
  32. False
  33. we keep it the same
  34. yeast
  35. press it gently
  36. True
  37. True
  38. we keep it the same
  39. the fulcrum
  40. we change it

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