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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 177 · 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 turmeric powder for the ruler lever? (a) needed (b) not needed
  2. 2.⚖️ 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 number of coins (d) which side goes down
  3. 3.🔮 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) neither, it balances (c) the right side (d) the left side
  4. 4.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a slide (c) a bottle opener (d) a crowbar
  5. 5.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
  6. 6.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
  7. 7.⚖️ 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
  8. 8.⚖️ 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 change it (c) we keep it the same
  9. 9.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) a lever boosts your push (c) the spoon is magnetic (d) the spoon is hot
  10. 10.⚖️ 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) the kind of coins (c) distance from the pencil
  11. 11.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a round pencil (c) a 30 cm ruler (d) coins of one kind
  12. 12.🛟 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
  13. 13.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  14. 14.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a 30 cm ruler (d) yeast
  15. 15.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) turmeric powder (d) a flat table
  16. 16.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
  17. 17.⚖️ 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?
  18. 18.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a balloon (c) yeast (d) a 30 cm ruler
  19. 19.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) equal on both sides (d) zero
  20. 20.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a sloping road (c) a bottle opener (d) a steering wheel
  21. 21.True or false: a bottle opener is an inclined plane. (a) False (b) True
  22. 22.⚖️ 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) False (b) True
  23. 23.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  24. 24.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 8 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
  25. 25.⚖️ 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
  26. 26.⚖️ 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 change it (c) we measure it
  27. 27.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a round pencil (c) a magnet (d) a battery cell
  28. 28.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
  29. 29.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 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?
  30. 30.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) stand on the ruler (d) press it gently
  31. 31.⚖️ 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
  32. 32.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a slide (c) a flagpole (d) a doorknob
  33. 33.⚖️ 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 measure it (b) we change it (c) we keep it the same
  34. 34.True or false: a magnet is needed for the ruler lever. (a) True (b) False
  35. 35.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
  36. 36.⚖️ 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) False (b) True
  37. 37.⚙️ Which of these uses a pulley? (a) a slide (b) a see-saw (c) a crane (d) a ramp
  38. 38.⚖️ 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
  39. 39.⚙️ Which of these is an inclined plane? (a) a ramp (b) a crowbar (c) a bottle opener (d) a steering wheel
  40. 40.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley

Answer key

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

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