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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 978 · 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 1 coin 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?
  2. 2.⚙️ Which simple machine is a see-saw? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
  3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a magnet (d) a flat table
  4. 4.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
  5. 5.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
  6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
  7. 7.True or false: a mirror is needed for the ruler lever. (a) True (b) False
  8. 8.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
  9. 9.⚖️ 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 keep it the same (c) we change it
  10. 10.🛟 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
  11. 11.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
  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) where the pencil is (d) distance from the pencil
  13. 13.⚙️ Which of these uses a pulley? (a) a flagpole (b) a spoon lifting a lid (c) a see-saw (d) a steering wheel
  14. 14.True or false: a bottle opener uses a pulley. (a) False (b) True
  15. 15.True or false: yeast is needed for the ruler lever. (a) False (b) True
  16. 16.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
  17. 17.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) easier (d) impossible
  18. 18.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 1 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
  19. 19.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
  20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) a mirror
  21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a 30 cm ruler (c) coins of one kind (d) a round pencil
  22. 22.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
  23. 23.🛟 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
  24. 24.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) a lever boosts your push (c) the spoon is magnetic (d) the spoon is hot
  25. 25.⚖️ 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
  26. 26.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a spoon lifting a lid (c) a slide (d) a flagpole
  27. 27.⚖️ 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
  28. 28.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
  29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a battery cell (c) a flat table (d) a round pencil
  30. 30.⚖️ 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?
  31. 31.⚖️ 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 same ruler (b) the number of coins (c) distance from the pencil (d) which side goes down
  32. 32.⚙️ Which simple machine is a sloping road? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
  33. 33.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 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?
  34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we measure it (b) we keep it the same (c) we change it
  35. 35.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a flagpole (c) a well pulley (d) a see-saw
  36. 36.⚙️ Which of these is a lever? (a) a well pulley (b) a sloping road (c) a bottle opener (d) a tap handle
  37. 37.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a magnet (c) a round pencil (d) a flat table
  38. 38.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a balloon (c) a flat table (d) yeast
  39. 39.⚖️ 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
  40. 40.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) turmeric powder (d) a round pencil

Answer key

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

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