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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 753 · 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 what we measure? (a) the kind of coins (b) where the pencil is (c) which side goes down (d) the same ruler
  2. 2.True or false: yeast is not needed for the ruler lever. (a) False (b) True
  3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a mirror (d) a round pencil
  4. 4.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
  5. 5.True or false: a slide is an inclined plane. (a) False (b) True
  6. 6.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a ramp (c) a doorknob (d) a well pulley
  7. 7.🧺 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 battery cell
  8. 8.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the fulcrum (d) the load
  9. 9.⚖️ 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) the same ruler (d) distance from the pencil
  10. 10.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
  11. 11.🔮 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 right side (b) the left side (c) both go up (d) neither, it balances
  12. 12.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) yeast (c) a round pencil (d) a battery cell
  13. 13.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
  14. 14.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
  15. 15.⚖️ 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 change it (b) we measure it (c) we keep it the same
  16. 16.⚖️ 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
  17. 17.🛟 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
  18. 18.True or false: a magnet is needed for the ruler lever. (a) False (b) True
  19. 19.⚖️ 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?
  20. 20.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  21. 21.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
  22. 22.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) False (b) True
  23. 23.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) always 10 (c) equal on both sides (d) zero
  24. 24.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
  25. 25.True or false: a spoon lifting a lid is a wheel and axle. (a) False (b) True
  26. 26.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
  27. 27.True or false: a see-saw is an inclined plane. (a) True (b) False
  28. 28.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
  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 what we measure. (a) True (b) False
  30. 30.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
  31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a magnet (d) a round pencil
  32. 32.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) yeast (d) coins of one kind
  33. 33.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) coins of one kind (d) a battery cell
  34. 34.⚖️ 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
  35. 35.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
  36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) turmeric powder (c) a flat table (d) a round pencil
  37. 37.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a well pulley (c) a sloping road (d) a bottle opener
  38. 38.⚖️ 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?
  39. 39.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  40. 40.⚖️ 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

Answer key

  1. which side goes down
  2. True
  3. a mirror
  4. True
  5. True
  6. a ramp
  7. a battery cell
  8. the fulcrum
  9. distance from the pencil
  10. 3
  11. the right side
  12. a round pencil
  13. False
  14. needed
  15. we measure it
  16. we change it
  17. press it gently
  18. False
  19. 8
  20. 8
  21. 6
  22. False
  23. equal on both sides
  24. 4
  25. False
  26. a lever
  27. False
  28. not needed
  29. False
  30. needed
  31. a magnet
  32. yeast
  33. a battery cell
  34. True
  35. False
  36. turmeric powder
  37. a sloping road
  38. 2
  39. 2
  40. we keep it the same

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