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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 942 · 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 “where the pencil is”? (a) we change it (b) we measure it (c) we keep it the same
  2. 2.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
  3. 3.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
  4. 4.⚙️ Which simple machine is a sloping road? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
  5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) coins of one kind (d) a magnet
  6. 6.⚖️ 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) distance from the pencil (c) the same ruler
  7. 7.⚖️ 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?
  8. 8.⚙️ Which of these is a lever? (a) a steering wheel (b) a ramp (c) a crane (d) a see-saw
  9. 9.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
  10. 10.⚖️ 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 change it (b) we measure it (c) we keep it the same
  11. 11.⚖️ 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 change it (b) we keep it the same (c) we measure 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) a balloon (d) a round pencil
  13. 13.True or false: a see-saw is a lever. (a) False (b) True
  14. 14.🛟 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
  15. 15.⚖️ 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) False (b) True
  16. 16.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
  17. 17.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) flick coins at faces (d) bend it till it snaps
  18. 18.⚖️ 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) False (b) True
  19. 19.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) jump up and down (d) sit farther from middle
  20. 20.⚖️ 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 same ruler (b) where the pencil is (c) distance from the pencil (d) the kind of coins
  21. 21.⚖️ 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
  22. 22.⚖️ 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?
  23. 23.⚙️ Which simple machine is a slide? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
  24. 24.⚙️ Which of these is a lever? (a) a well pulley (b) a steering wheel (c) a crowbar (d) a crane
  25. 25.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  26. 26.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
  27. 27.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
  28. 28.True or false: yeast is needed for the ruler lever. (a) True (b) False
  29. 29.⚖️ 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) distance from the pencil (c) the same ruler (d) which side goes down
  30. 30.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
  31. 31.🔮 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) both go up (c) the left side (d) the right side
  32. 32.⚖️ 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?
  33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a flat table (c) coins of one kind (d) a 30 cm ruler
  34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) yeast (c) coins of one kind (d) a round pencil
  35. 35.⚙️ Which simple machine is a ramp? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
  36. 36.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
  37. 37.True or false: a see-saw is a wheel and axle. (a) False (b) True
  38. 38.⚙️ Which of these is an inclined plane? (a) a crane (b) a doorknob (c) a tap handle (d) a ramp
  39. 39.⚖️ 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
  40. 40.True or false: yeast is not needed for the ruler lever. (a) False (b) True

Answer key

  1. we keep it the same
  2. a wheel and axle
  3. not needed
  4. an inclined plane
  5. a magnet
  6. the same ruler
  7. 2
  8. a see-saw
  9. 6
  10. we keep it the same
  11. we keep it the same
  12. a balloon
  13. True
  14. they may swallow them
  15. True
  16. a lever
  17. press it gently
  18. True
  19. sit farther from middle
  20. distance from the pencil
  21. we measure it
  22. 2
  23. an inclined plane
  24. a crowbar
  25. 2
  26. 3
  27. easier
  28. False
  29. which side goes down
  30. the fulcrum
  31. the right side
  32. 5
  33. turmeric powder
  34. yeast
  35. an inclined plane
  36. not needed
  37. False
  38. a ramp
  39. True
  40. True

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