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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 675 · 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.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) press it gently (d) flick coins at faces
  2. 2.⚖️ 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) which side goes down (d) distance from the pencil
  3. 3.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) yeast (c) a mirror (d) a balloon
  4. 4.🔮 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) neither, it balances (d) both go up
  5. 5.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  6. 6.⚖️ 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?
  7. 7.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  8. 8.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) the same ruler (c) which side goes down
  9. 9.True or false: a bottle opener is a lever. (a) False (b) True
  10. 10.⚖️ 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 change it (b) we keep it the same (c) we measure it
  11. 11.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
  12. 12.True or false: a doorknob uses a pulley. (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 “which side goes down”? (a) we measure it (b) we change it (c) we keep it the same
  14. 14.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) the same (d) impossible
  15. 15.⚙️ Which of these is an inclined plane? (a) a crane (b) a slide (c) a flagpole (d) a well pulley
  16. 16.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
  17. 17.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) yeast (c) a round pencil (d) a 30 cm ruler
  18. 18.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a spoon lifting a lid (c) a flagpole (d) a sloping road
  19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a balloon (d) coins of one kind
  20. 20.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) jump up and down (d) sit farther from middle
  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 what we measure. (a) False (b) True
  22. 22.⚖️ 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
  23. 23.⚖️ 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) True (b) False
  24. 24.⚖️ 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) where the pencil is (c) the same ruler (d) which side goes down
  25. 25.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
  26. 26.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is magnetic (c) a lever boosts your push (d) the spoon is hot
  27. 27.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
  28. 28.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
  29. 29.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they are magnetic (d) they may swallow them
  30. 30.🧺 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
  31. 31.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 1 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
  32. 32.⚖️ 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
  33. 33.⚙️ Which of these is a lever? (a) a well pulley (b) a spoon lifting a lid (c) a crane (d) a sloping road
  34. 34.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
  35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) False (b) True
  36. 36.⚖️ 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) True (b) False
  37. 37.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
  38. 38.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
  39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
  40. 40.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed

Answer key

  1. press it gently
  2. distance from the pencil
  3. a flat table
  4. the right side
  5. 4
  6. 1
  7. 12
  8. the same ruler
  9. True
  10. we keep it the same
  11. needed
  12. False
  13. we measure it
  14. easier
  15. a slide
  16. True
  17. yeast
  18. a flagpole
  19. a balloon
  20. sit farther from middle
  21. False
  22. we change it
  23. True
  24. which side goes down
  25. a wheel and axle
  26. a lever boosts your push
  27. 12
  28. the fulcrum
  29. they may swallow them
  30. a mirror
  31. 1
  32. True
  33. a spoon lifting a lid
  34. not needed
  35. False
  36. False
  37. True
  38. not needed
  39. False
  40. not needed

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