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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 440 · 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.

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  1. 1.⚙️ Which simple machine is a well pulley? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
  2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
  3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) turmeric powder (d) coins of one kind
  4. 4.⚖️ 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) the number of coins (c) which side goes down (d) the same ruler
  5. 5.⚖️ 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
  6. 6.🛟 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
  7. 7.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a slide (c) a doorknob (d) a bottle opener
  8. 8.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
  9. 9.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 5 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? Which of these is what we measure? (a) which side goes down (b) the kind of coins (c) the number of coins (d) distance from the pencil
  11. 11.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 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?
  12. 12.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
  13. 13.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
  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 the one thing we change. (a) False (b) True
  15. 15.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
  16. 16.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
  17. 17.True or false: a crane is a wheel and axle. (a) False (b) True
  18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) coins of one kind (d) a magnet
  19. 19.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
  20. 20.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a mirror (d) yeast
  21. 21.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
  22. 22.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a tap handle (c) a see-saw (d) a spoon lifting a lid
  23. 23.⚖️ 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 change it (b) we measure it (c) we keep it the same
  24. 24.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
  25. 25.⚖️ 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?
  26. 26.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a balloon (c) a battery cell (d) coins of one kind
  27. 27.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a magnet
  28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) which side goes down (c) the number of coins
  29. 29.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
  30. 30.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a flat table (d) a 30 cm ruler
  31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a 30 cm ruler (c) coins of one kind (d) a flat table
  32. 32.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  33. 33.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) False (b) True
  34. 34.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a 30 cm ruler (d) a balloon
  35. 35.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
  36. 36.⚙️ Which simple machine is a slide? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
  37. 37.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
  38. 38.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a mirror (d) a flat table
  39. 39.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
  40. 40.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) the spoon is hot (d) a lever boosts your push

Answer key

  1. a pulley
  2. easier
  3. turmeric powder
  4. distance from the pencil
  5. we measure it
  6. press it gently
  7. a slide
  8. False
  9. 2
  10. which side goes down
  11. 6
  12. 6
  13. not needed
  14. False
  15. True
  16. not needed
  17. False
  18. a magnet
  19. needed
  20. a 30 cm ruler
  21. False
  22. a tap handle
  23. we change it
  24. a lever
  25. 3
  26. coins of one kind
  27. a magnet
  28. the number of coins
  29. they may swallow them
  30. yeast
  31. a balloon
  32. 5
  33. False
  34. a balloon
  35. True
  36. an inclined plane
  37. True
  38. a mirror
  39. a lever
  40. a lever boosts your push

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