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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 881 · 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.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
  2. 2.True or false: a flat table is 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 mirror (b) a flat table (c) a 30 cm ruler (d) coins of one kind
  4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) turmeric powder (d) coins of one kind
  5. 5.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
  6. 6.True or false: a see-saw is a lever. (a) False (b) True
  7. 7.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) flick coins at faces (d) stand on the ruler
  8. 8.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
  9. 9.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) the same (d) impossible
  10. 10.True or false: a bottle opener uses a pulley. (a) True (b) False
  11. 11.⚖️ 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) where the pencil is (b) the number of coins (c) distance from the pencil (d) which side goes down
  12. 12.⚖️ 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) True (b) False
  13. 13.⚖️ 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 change it (c) we keep it the same
  14. 14.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit farther from middle (c) sit on the middle (d) sit closer to middle
  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 keep it the same (c) we measure it
  16. 16.🔮 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 left side (c) the right side (d) neither, it balances
  17. 17.⚖️ 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 change it (b) we keep it the same (c) we measure it
  18. 18.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
  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 the one thing we change. (a) False (b) True
  20. 20.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
  21. 21.⚖️ 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
  22. 22.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) the number of coins (c) distance from the pencil
  23. 23.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
  24. 24.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a well pulley (c) a sloping road (d) a see-saw
  25. 25.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
  26. 26.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
  27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) yeast (d) coins of one kind
  28. 28.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a flat table (d) a round pencil
  29. 29.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
  30. 30.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) bigger on the left (d) equal on both sides
  31. 31.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a battery cell (c) a flat table (d) coins of one kind
  32. 32.⚖️ 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 number of coins (b) the same ruler (c) which side goes down (d) distance from the pencil
  33. 33.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) False (b) True
  34. 34.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
  35. 35.⚖️ 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 1 cm to the right to balance it?
  36. 36.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
  37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) the same ruler (c) distance from the pencil
  38. 38.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a bottle opener (c) a slide (d) a tap handle
  39. 39.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a mirror (c) turmeric powder (d) a flat table
  40. 40.⚙️ Which of these is a lever? (a) a flagpole (b) a ramp (c) a see-saw (d) a well pulley

Answer key

  1. 2
  2. True
  3. a mirror
  4. turmeric powder
  5. a lever
  6. True
  7. press it gently
  8. True
  9. easier
  10. False
  11. distance from the pencil
  12. True
  13. we change it
  14. sit farther from middle
  15. we measure it
  16. the right side
  17. we keep it the same
  18. not needed
  19. True
  20. needed
  21. True
  22. the number of coins
  23. not needed
  24. a sloping road
  25. a lever
  26. they may swallow them
  27. yeast
  28. a balloon
  29. 3
  30. equal on both sides
  31. a battery cell
  32. which side goes down
  33. False
  34. the fulcrum
  35. 2
  36. True
  37. the same ruler
  38. a slide
  39. a flat table
  40. a see-saw

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