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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 971 · 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: yeast is needed for the ruler lever. (a) False (b) True
  2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a flat table (c) a round pencil (d) a 30 cm ruler
  3. 3.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
  4. 4.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) the spoon is magnetic (d) a lever boosts your push
  5. 5.True or false: a sloping road is an inclined plane. (a) True (b) False
  6. 6.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
  7. 7.⚖️ 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?
  8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) turmeric powder (d) coins of one kind
  9. 9.⚙️ Which of these is a lever? (a) a flagpole (b) a sloping road (c) a crane (d) a bottle opener
  10. 10.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) always 10 (d) equal on both sides
  11. 11.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
  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 number of coins (b) the same ruler (c) distance from the pencil (d) the kind of coins
  13. 13.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
  14. 14.⚙️ Which of these uses a pulley? (a) a doorknob (b) a spoon lifting a lid (c) a sloping road (d) a flagpole
  15. 15.⚖️ 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
  16. 16.True or false: a flat table is needed for the ruler lever. (a) True (b) False
  17. 17.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a flat table (c) a balloon (d) a mirror
  18. 18.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) easier (d) the same
  19. 19.⚖️ 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 measure it (c) we change it
  20. 20.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
  21. 21.⚖️ 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 keep it the same (c) we measure it
  22. 22.⚖️ 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 same ruler (c) which side goes down (d) the number of coins
  23. 23.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
  24. 24.⚖️ 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 6 cm to the right to balance it?
  25. 25.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
  26. 26.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 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?
  27. 27.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
  28. 28.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) press it gently (d) stand on the ruler
  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 keep it the same (b) we measure it (c) we change it
  30. 30.⚖️ 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
  31. 31.⚖️ 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 keep it the same (b) we change it (c) we measure it
  32. 32.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
  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 the one thing we change. (a) True (b) False
  34. 34.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a round pencil (d) a battery cell
  35. 35.⚙️ Which simple machine is a well pulley? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
  36. 36.🔮 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) neither, it balances (c) the left side (d) both go up
  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) distance from the pencil (c) the same ruler
  38. 38.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
  39. 39.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a balloon (d) a flat table
  40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a battery cell (d) a 30 cm ruler

Answer key

  1. False
  2. a magnet
  3. needed
  4. a lever boosts your push
  5. True
  6. True
  7. 4
  8. turmeric powder
  9. a bottle opener
  10. equal on both sides
  11. True
  12. distance from the pencil
  13. needed
  14. a flagpole
  15. True
  16. True
  17. a flat table
  18. easier
  19. we keep it the same
  20. 5
  21. we keep it the same
  22. which side goes down
  23. a wheel and axle
  24. 3
  25. the fulcrum
  26. 4
  27. 1
  28. press it gently
  29. we change it
  30. True
  31. we keep it the same
  32. 1
  33. False
  34. a battery cell
  35. a pulley
  36. the right side
  37. the same ruler
  38. not needed
  39. a balloon
  40. a battery cell

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