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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 540 · 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.True or false: a mirror is needed for the ruler lever. (a) False (b) True
  2. 2.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
  3. 3.⚖️ 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) where the pencil is (c) the number of coins (d) distance from the pencil
  4. 4.⚖️ 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 measure it (b) we keep it the same (c) we change it
  5. 5.🧺 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) turmeric powder
  6. 6.⚖️ 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) distance from the pencil (b) the kind of coins (c) which side goes down (d) the number of coins
  7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
  8. 8.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) turmeric powder (c) a magnet (d) a flat table
  9. 9.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
  10. 10.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a doorknob (c) a bottle opener (d) a spoon lifting a lid
  11. 11.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they may swallow them (d) they are magnetic
  12. 12.True or false: yeast is not needed for the ruler lever. (a) False (b) True
  13. 13.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit on the middle (d) sit closer to middle
  14. 14.True or false: a tap handle uses a pulley. (a) False (b) True
  15. 15.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 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?
  16. 16.⚙️ Which simple machine is a slide? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
  17. 17.⚖️ 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 keep it the same (c) we change it
  18. 18.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  19. 19.⚖️ 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) False (b) True
  20. 20.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
  21. 21.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
  22. 22.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) always 10 (d) equal on both sides
  23. 23.⚙️ Which simple machine is a flagpole? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
  24. 24.⚖️ 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
  25. 25.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 3 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
  26. 26.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a sloping road (c) a bottle opener (d) a spoon lifting a lid
  27. 27.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a bottle opener (c) a well pulley (d) a sloping road
  28. 28.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
  29. 29.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
  30. 30.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a bottle opener (c) a ramp (d) a steering wheel
  31. 31.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
  32. 32.⚖️ 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 change it (b) we keep it the same (c) we measure it
  33. 33.🧺 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 round pencil
  34. 34.⚖️ 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 keep it the same (c) we measure it
  35. 35.⚖️ 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
  36. 36.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
  37. 37.True or false: a magnet is needed for the ruler lever. (a) True (b) False
  38. 38.⚖️ 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 keep it the same (b) we change it (c) we measure it
  39. 39.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
  40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a mirror (d) coins of one kind

Answer key

  1. False
  2. the fulcrum
  3. which side goes down
  4. we keep it the same
  5. turmeric powder
  6. distance from the pencil
  7. easier
  8. a flat table
  9. not needed
  10. a doorknob
  11. they may swallow them
  12. True
  13. sit farther from middle
  14. False
  15. 4
  16. an inclined plane
  17. we keep it the same
  18. 3
  19. False
  20. not needed
  21. 2
  22. equal on both sides
  23. a pulley
  24. a lever boosts your push
  25. 3
  26. a sloping road
  27. a well pulley
  28. not needed
  29. a lever
  30. a ramp
  31. 2
  32. we keep it the same
  33. yeast
  34. we change it
  35. we measure it
  36. True
  37. False
  38. we keep it the same
  39. True
  40. a mirror

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