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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 916 · 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? Which of these is the one thing we change? (a) the kind of coins (b) the same ruler (c) distance from the pencil (d) which side goes down
  2. 2.⚖️ 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
  3. 3.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
  4. 4.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
  5. 5.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
  6. 6.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
  7. 7.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit closer to middle (c) jump up and down (d) sit on the middle
  8. 8.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
  9. 9.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
  10. 10.True or false: a well pulley uses a pulley. (a) False (b) True
  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) which side goes down (b) the kind of coins (c) the same ruler (d) distance from the pencil
  12. 12.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too shiny (c) they are magnetic (d) they are too cold
  13. 13.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
  14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a balloon (c) coins of one kind (d) a 30 cm ruler
  15. 15.⚙️ Which simple machine is a tap handle? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
  16. 16.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
  17. 17.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
  18. 18.⚖️ 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
  19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a mirror (d) a flat table
  20. 20.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the left side (b) neither, it balances (c) both go up (d) the right side
  21. 21.⚖️ 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
  22. 22.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a slide (c) a flagpole (d) a crane
  23. 23.⚖️ 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
  24. 24.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
  25. 25.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a flat table (c) a magnet (d) a balloon
  26. 26.⚖️ 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 measure it (b) we change it (c) we keep it the same
  27. 27.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 10 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?
  28. 28.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) stand on the ruler (d) bend it till it snaps
  29. 29.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
  30. 30.⚖️ 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 keep it the same (b) we measure it (c) we change it
  31. 31.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 10 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?
  32. 32.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
  33. 33.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) turmeric powder (c) yeast (d) a 30 cm ruler
  34. 34.⚖️ 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
  35. 35.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
  36. 36.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a round pencil (d) a magnet
  37. 37.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) the spoon is magnetic (d) a lever boosts your push
  38. 38.True or false: a sloping road is an inclined plane. (a) False (b) True
  39. 39.⚙️ Which simple machine is a flagpole? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
  40. 40.⚖️ 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) where the pencil is

Answer key

  1. distance from the pencil
  2. we keep it the same
  3. True
  4. 1
  5. True
  6. easier
  7. sit farther from middle
  8. not needed
  9. a pulley
  10. True
  11. which side goes down
  12. they may swallow them
  13. a lever
  14. a balloon
  15. a wheel and axle
  16. 1
  17. 6
  18. True
  19. a mirror
  20. the right side
  21. True
  22. a steering wheel
  23. we keep it the same
  24. 5
  25. a flat table
  26. we keep it the same
  27. 8
  28. press it gently
  29. not needed
  30. we change it
  31. 10
  32. False
  33. a 30 cm ruler
  34. we measure it
  35. True
  36. a round pencil
  37. a lever boosts your push
  38. True
  39. a pulley
  40. where the pencil is

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