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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 701 · 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 wheel and axle? (a) a tap handle (b) a crane (c) a slide (d) a crowbar
  2. 2.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
  3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) yeast (c) a round pencil (d) a 30 cm ruler
  4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) True (b) False
  5. 5.True or false: yeast is needed for the ruler lever. (a) True (b) False
  6. 6.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) flick coins at faces (d) stand on the ruler
  7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) True (b) False
  8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a magnet (c) a round pencil (d) coins of one kind
  9. 9.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
  10. 10.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they are too cold (d) they may swallow them
  11. 11.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
  12. 12.⚖️ 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 keep it the same (b) we change it (c) we measure it
  13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
  14. 14.⚖️ 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
  15. 15.⚖️ 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
  16. 16.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
  17. 17.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a 30 cm ruler (c) a magnet (d) a balloon
  18. 18.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
  19. 19.⚖️ 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 keep it the same (b) we measure it (c) we change it
  20. 20.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
  21. 21.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
  22. 22.⚖️ 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) where the pencil is (b) distance from the pencil (c) which side goes down (d) the number of coins
  23. 23.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
  24. 24.⚖️ 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
  25. 25.⚖️ 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 keep it the same (c) we measure it
  26. 26.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a round pencil (d) turmeric powder
  27. 27.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
  28. 28.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a crowbar (c) a ramp (d) a doorknob
  29. 29.🔮 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) both go up (c) the left side (d) neither, it balances
  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.True or false: a crowbar is a lever. (a) False (b) True
  32. 32.True or false: a slide is an inclined plane. (a) False (b) True
  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.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
  35. 35.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 12 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
  36. 36.⚖️ 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
  37. 37.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) bigger on the left (d) zero
  38. 38.True or false: a see-saw is a lever. (a) True (b) False
  39. 39.True or false: a well pulley uses a pulley. (a) False (b) True
  40. 40.⚖️ 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

Answer key

  1. a tap handle
  2. a lever
  3. yeast
  4. True
  5. False
  6. press it gently
  7. True
  8. a magnet
  9. not needed
  10. they may swallow them
  11. the fulcrum
  12. we keep it the same
  13. a mirror
  14. True
  15. sit farther from middle
  16. 1
  17. a 30 cm ruler
  18. not needed
  19. we keep it the same
  20. 3
  21. needed
  22. distance from the pencil
  23. True
  24. we keep it the same
  25. we measure it
  26. turmeric powder
  27. 3
  28. a doorknob
  29. the right side
  30. False
  31. True
  32. True
  33. True
  34. True
  35. 6
  36. we keep it the same
  37. equal on both sides
  38. True
  39. True
  40. True

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