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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 924 · 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: the same ruler is the one thing we change. (a) True (b) False
  2. 2.⚖️ 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) False (b) True
  3. 3.⚖️ 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
  4. 4.⚖️ 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) which side goes down (c) the same ruler
  5. 5.⚖️ 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 closer to middle (d) sit on the middle
  6. 6.⚖️ 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
  7. 7.⚖️ 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
  8. 8.⚖️ 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 kind of coins (c) which side goes down (d) distance from the pencil
  9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) turmeric powder (d) a round pencil
  10. 10.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) impossible (d) easier
  11. 11.True or false: a mirror is needed for the ruler lever. (a) False (b) True
  12. 12.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
  13. 13.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
  14. 14.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
  15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
  16. 16.⚙️ Which of these is a lever? (a) a ramp (b) a crowbar (c) a doorknob (d) a steering wheel
  17. 17.⚖️ 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) where the pencil is (c) the kind of coins (d) the same ruler
  18. 18.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  19. 19.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
  20. 20.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
  21. 21.True or false: a 30 cm ruler is needed for the ruler lever. (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 “the same ruler”? (a) we keep it the same (b) we change it (c) we measure it
  23. 23.🔮 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) the left side (d) both go up
  24. 24.🛟 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
  25. 25.⚙️ Which of these is an inclined plane? (a) a crane (b) a bottle opener (c) a ramp (d) a well pulley
  26. 26.⚙️ Which simple machine is a tap handle? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
  27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
  28. 28.🛟 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
  29. 29.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the load (d) the fulcrum
  30. 30.⚖️ 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
  31. 31.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
  32. 32.⚖️ 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
  33. 33.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
  34. 34.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the spoon is hot (c) the lid gets softer (d) a lever boosts your push
  35. 35.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a battery cell
  36. 36.⚙️ Which of these is an inclined plane? (a) a crane (b) a crowbar (c) a tap handle (d) a slide
  37. 37.⚙️ Which of these is a lever? (a) a flagpole (b) a slide (c) a crane (d) a see-saw
  38. 38.⚖️ 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) True (b) False
  39. 39.⚙️ Which of these is a lever? (a) a flagpole (b) a spoon lifting a lid (c) a crane (d) a ramp
  40. 40.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a 30 cm ruler (d) a magnet

Answer key

  1. False
  2. True
  3. the kind of coins
  4. the same ruler
  5. sit farther from middle
  6. we keep it the same
  7. True
  8. which side goes down
  9. turmeric powder
  10. easier
  11. False
  12. not needed
  13. not needed
  14. a lever
  15. a magnet
  16. a crowbar
  17. distance from the pencil
  18. 4
  19. True
  20. False
  21. True
  22. we keep it the same
  23. the right side
  24. they may swallow them
  25. a ramp
  26. a wheel and axle
  27. a balloon
  28. press it gently
  29. the fulcrum
  30. equal on both sides
  31. 10
  32. True
  33. 2
  34. a lever boosts your push
  35. a battery cell
  36. a slide
  37. a see-saw
  38. True
  39. a spoon lifting a lid
  40. a 30 cm ruler

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