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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 257 · 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.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
  2. 2.🔮 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
  3. 3.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they are too shiny (d) they may swallow them
  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) False (b) True
  5. 5.True or false: a round pencil 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) flick coins at faces (b) press it gently (c) bend it till it snaps (d) stand on the ruler
  7. 7.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
  8. 8.⚖️ 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
  9. 9.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
  10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a flat table (d) a mirror
  11. 11.⚖️ 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
  12. 12.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) turmeric powder (c) yeast (d) a battery cell
  13. 13.⚖️ 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 measure it (c) we keep it the same
  14. 14.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
  15. 15.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a battery cell (c) a flat table (d) turmeric powder
  16. 16.⚖️ 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) distance from the pencil (b) which side goes down (c) the kind of coins (d) the same ruler
  17. 17.⚙️ Which simple machine is a steering wheel? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
  18. 18.True or false: a flagpole uses a pulley. (a) False (b) True
  19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a magnet (c) a round pencil (d) coins of one kind
  20. 20.⚖️ 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 measure it (c) we change it
  21. 21.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
  22. 22.⚙️ Which simple machine is a sloping road? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
  23. 23.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
  24. 24.True or false: a well pulley is an inclined plane. (a) False (b) True
  25. 25.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit on the middle (c) sit farther from middle (d) sit closer to middle
  26. 26.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a magnet (c) yeast (d) a round pencil
  27. 27.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a tap handle (c) a well pulley (d) a slide
  28. 28.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 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?
  29. 29.⚖️ 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
  30. 30.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the axle (d) the effort
  31. 31.⚖️ 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 4 cm to the right to balance it?
  32. 32.True or false: a flat table is needed for the ruler lever. (a) True (b) False
  33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) turmeric powder (d) a flat table
  34. 34.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
  35. 35.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) a balloon
  36. 36.⚖️ 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
  37. 37.⚖️ 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
  38. 38.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
  39. 39.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
  40. 40.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False

Answer key

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

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