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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 827 · 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.🔮 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) the right side (c) the left side (d) neither, it balances
  2. 2.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  3. 3.⚖️ 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
  4. 4.⚖️ 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
  5. 5.⚖️ 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
  6. 6.True or false: a bottle opener is an inclined plane. (a) True (b) False
  7. 7.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
  8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a magnet (c) coins of one kind (d) a flat table
  9. 9.⚖️ 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 number of coins (b) which side goes down (c) distance from the pencil
  10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) a balloon
  11. 11.⚙️ Which simple machine is a flagpole? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
  12. 12.⚖️ 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 same ruler (b) the number of coins (c) distance from the pencil (d) the kind of coins
  13. 13.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
  14. 14.⚖️ 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 same ruler (c) distance from the pencil (d) the kind of coins
  15. 15.⚖️ 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
  16. 16.⚖️ 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?
  17. 17.⚖️ 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 measure it (b) we keep it the same (c) we change it
  18. 18.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a mirror (d) a balloon
  19. 19.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a crane (c) a ramp (d) a see-saw
  20. 20.True or false: a spoon lifting a lid is a lever. (a) False (b) True
  21. 21.⚙️ Which of these is a lever? (a) a crane (b) a crowbar (c) a steering wheel (d) a sloping road
  22. 22.True or false: a magnet is needed for the ruler lever. (a) False (b) True
  23. 23.True or false: a sloping road is an inclined plane. (a) True (b) False
  24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) yeast (d) coins of one kind
  25. 25.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
  26. 26.🧺 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 battery cell (d) a flat table
  27. 27.⚙️ Which of these uses a pulley? (a) a doorknob (b) a crowbar (c) a sloping road (d) a well pulley
  28. 28.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are magnetic (d) they are too shiny
  29. 29.⚖️ 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 keep it the same (c) we change it
  30. 30.⚙️ Which simple machine is a see-saw? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
  31. 31.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) easier (d) the same
  32. 32.⚙️ Which of these uses a pulley? (a) a sloping road (b) a slide (c) a crane (d) a steering wheel
  33. 33.⚖️ 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) True (b) False
  34. 34.⚙️ Which simple machine is a doorknob? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
  35. 35.⚖️ 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?
  36. 36.⚙️ Which of these uses a pulley? (a) a see-saw (b) a spoon lifting a lid (c) a flagpole (d) a bottle opener
  37. 37.⚖️ 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
  38. 38.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
  39. 39.⚖️ 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 change it (c) we keep it the same
  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 flat table

Answer key

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

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