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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 747 · 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.⚙️ Which simple machine is a crane? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
  2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a 30 cm ruler (c) coins of one kind (d) a flat table
  3. 3.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) turmeric powder (c) a battery cell (d) yeast
  4. 4.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
  5. 5.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
  6. 6.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
  7. 7.⚙️ Which of these is a wheel and axle? (a) a flagpole (b) a slide (c) a ramp (d) a steering wheel
  8. 8.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
  9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) turmeric powder (c) a 30 cm ruler (d) a flat table
  10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a balloon (d) a flat table
  11. 11.⚖️ 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) True (b) False
  12. 12.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) bend it till it snaps (d) flick coins at faces
  13. 13.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) impossible (d) easier
  14. 14.⚖️ 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
  15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) a mirror
  16. 16.⚖️ 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) where the pencil is (c) which side goes down
  17. 17.True or false: a mirror is needed for the ruler lever. (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) a battery cell (d) coins of one kind
  19. 19.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
  20. 20.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  21. 21.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too cold (d) they are too shiny
  22. 22.⚖️ 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
  23. 23.⚖️ 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
  24. 24.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
  25. 25.⚖️ 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
  26. 26.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 1 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?
  27. 27.⚖️ 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
  28. 28.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
  29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) False (b) True
  30. 30.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
  31. 31.True or false: a slide is an inclined plane. (a) True (b) False
  32. 32.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) True (b) False
  33. 33.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a see-saw (c) a bottle opener (d) a flagpole
  34. 34.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
  35. 35.⚖️ 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?
  36. 36.⚖️ 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 number of coins (c) where the pencil is (d) distance from the pencil
  37. 37.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
  38. 38.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
  39. 39.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) the spoon is magnetic (d) a lever boosts your push
  40. 40.⚖️ 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

Answer key

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

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