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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 438 · 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.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
  2. 2.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
  3. 3.⚖️ 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
  4. 4.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) yeast (d) a flat table
  5. 5.🔮 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 left side (b) neither, it balances (c) both go up (d) the right side
  6. 6.🧺 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 magnet
  7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) a magnet
  8. 8.⚖️ 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 kind of coins (b) the number of coins (c) distance from the pencil (d) where the pencil is
  9. 9.True or false: a ramp is an inclined plane. (a) False (b) True
  10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a mirror (c) a flat table (d) a round pencil
  11. 11.True or false: a sloping road is a wheel and axle. (a) True (b) False
  12. 12.⚖️ 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 keep it the same (b) we change it (c) we measure it
  13. 13.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) bend it till it snaps (d) press it gently
  14. 14.⚖️ 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?
  15. 15.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit closer to middle (c) sit on the middle (d) jump up and down
  16. 16.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a balloon (c) a 30 cm ruler (d) a round pencil
  17. 17.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a crane (c) a doorknob (d) a spoon lifting a lid
  18. 18.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are magnetic (d) they are too shiny
  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 change it (b) we measure it (c) we keep it the same
  20. 20.⚖️ 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
  21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a battery cell (d) a 30 cm ruler
  22. 22.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a crowbar (c) a flagpole (d) a ramp
  23. 23.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a mirror (c) a round pencil (d) turmeric powder
  24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) turmeric powder (d) coins of one kind
  25. 25.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
  26. 26.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 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.⚖️ 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 same ruler (b) which side goes down (c) distance from the pencil
  28. 28.⚖️ 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
  29. 29.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
  30. 30.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a 30 cm ruler (c) a battery cell (d) turmeric powder
  31. 31.⚖️ 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
  32. 32.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a flagpole (c) a spoon lifting a lid (d) a sloping road
  33. 33.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) easier (d) harder
  34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) yeast
  35. 35.⚖️ 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?
  36. 36.True or false: a round pencil is not 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? True or false: distance from the pencil is kept the same. (a) False (b) True
  38. 38.True or false: a steering wheel is a wheel and axle. (a) True (b) False
  39. 39.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a slide (c) a bottle opener (d) a tap handle
  40. 40.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley

Answer key

  1. a wheel and axle
  2. not needed
  3. True
  4. yeast
  5. the right side
  6. a magnet
  7. a magnet
  8. distance from the pencil
  9. True
  10. a mirror
  11. False
  12. we keep it the same
  13. press it gently
  14. 4
  15. sit farther from middle
  16. a balloon
  17. a doorknob
  18. they may swallow them
  19. we keep it the same
  20. we change it
  21. a battery cell
  22. a flagpole
  23. a round pencil
  24. turmeric powder
  25. 6
  26. 5
  27. the same ruler
  28. we measure it
  29. needed
  30. a 30 cm ruler
  31. True
  32. a sloping road
  33. easier
  34. yeast
  35. 12
  36. False
  37. False
  38. True
  39. a slide
  40. a pulley

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