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Lever Experiment Worksheet

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

Answer key

  1. needed
  2. a lever boosts your push
  3. equal on both sides
  4. 12
  5. 5
  6. False
  7. True
  8. a balloon
  9. False
  10. they may swallow them
  11. we change it
  12. easier
  13. we keep it the same
  14. False
  15. not needed
  16. a pulley
  17. a crowbar
  18. False
  19. a lever
  20. the same ruler
  21. True
  22. distance from the pencil
  23. the number of coins
  24. the right side
  25. coins of one kind
  26. False
  27. 2
  28. a mirror
  29. yeast
  30. True
  31. False
  32. turmeric powder
  33. False
  34. a balloon
  35. 3
  36. 6
  37. sit farther from middle
  38. 5
  39. press it gently
  40. 10

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