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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 264 · 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? True or false: where the pencil is is the one thing we change. (a) False (b) True
  2. 2.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
  3. 3.🧺 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 flat table (d) yeast
  4. 4.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a sloping road (c) a doorknob (d) a spoon lifting a lid
  5. 5.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
  6. 6.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
  7. 7.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the right side (c) both go up (d) the left side
  8. 8.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
  9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) the kind of coins (c) the same ruler (d) which side goes down
  10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
  11. 11.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit farther from middle (c) jump up and down (d) sit on the middle
  12. 12.⚙️ Which of these uses a pulley? (a) a sloping road (b) a flagpole (c) a spoon lifting a lid (d) a steering wheel
  13. 13.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
  14. 14.⚖️ 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 measure it (c) we keep it the same
  15. 15.⚖️ 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?
  16. 16.⚖️ 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
  17. 17.⚖️ 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 kind of coins (b) which side goes down (c) distance from the pencil
  18. 18.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps
  19. 19.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
  20. 20.⚖️ 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) False (b) True
  21. 21.⚖️ 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
  22. 22.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 5 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  23. 23.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
  24. 24.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
  25. 25.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
  26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a battery cell (d) a 30 cm ruler
  27. 27.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
  28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
  29. 29.⚖️ 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
  30. 30.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
  31. 31.⚖️ 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?
  32. 32.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
  33. 33.⚖️ 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 same ruler (c) the kind of coins (d) where the pencil is
  34. 34.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) equal on both sides (d) always 10
  35. 35.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a balloon (d) a 30 cm ruler
  36. 36.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
  37. 37.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
  38. 38.True or false: a steering wheel is a wheel and axle. (a) False (b) True
  39. 39.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a mirror (c) a battery cell (d) coins of one kind
  40. 40.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a well pulley (c) a ramp (d) a doorknob

Answer key

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

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