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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 943 · 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 “distance from the pencil”? (a) we change it (b) we measure it (c) we keep it the same
  2. 2.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) always 10 (d) bigger on the left
  3. 3.⚖️ 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 keep it the same (b) we measure it (c) we change it
  4. 4.True or false: a flat table is needed for the ruler lever. (a) False (b) True
  5. 5.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
  6. 6.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) the same (d) easier
  7. 7.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
  8. 8.True or false: a bottle opener uses a pulley. (a) True (b) False
  9. 9.🔮 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
  10. 10.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
  11. 11.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) yeast (d) coins of one kind
  12. 12.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps
  13. 13.⚖️ 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 measure it (b) we change it (c) we keep it the same
  14. 14.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
  15. 15.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
  16. 16.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  17. 17.⚖️ 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 keep it the same (c) we measure it
  18. 18.⚖️ 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
  19. 19.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) yeast (c) a round pencil (d) a mirror
  20. 20.⚖️ 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
  21. 21.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a flat table (c) coins of one kind (d) a 30 cm ruler
  22. 22.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they may swallow them (d) they are magnetic
  23. 23.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 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?
  24. 24.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  25. 25.⚖️ 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 same ruler
  26. 26.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
  27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a battery cell (c) a flat table (d) coins of one kind
  28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) distance from the pencil (c) which side goes down (d) the number of coins
  29. 29.⚖️ 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
  30. 30.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a slide (c) a see-saw (d) a tap handle
  31. 31.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the spoon is magnetic (c) the lid gets softer (d) a lever boosts your push
  32. 32.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a magnet (c) a mirror (d) a balloon
  33. 33.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
  34. 34.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
  35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False
  36. 36.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
  37. 37.⚖️ 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
  38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
  39. 39.True or false: a spoon lifting a lid is an inclined plane. (a) True (b) False
  40. 40.🧺 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 round pencil

Answer key

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

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