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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 513 · 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) stand on the ruler (b) flick coins at faces (c) press it gently (d) bend it till it snaps
  2. 2.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are too shiny (d) they are magnetic
  3. 3.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
  4. 4.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
  5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
  6. 6.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
  7. 7.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
  8. 8.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) coins of one kind (d) a battery cell
  9. 9.🔮 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) both go up (c) the right side (d) the left side
  10. 10.⚖️ 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) True (b) False
  11. 11.⚖️ 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
  12. 12.⚙️ Which of these is a lever? (a) a crane (b) a steering wheel (c) a see-saw (d) a sloping road
  13. 13.⚖️ 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 number of coins (c) which side goes down
  14. 14.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a crowbar (c) a see-saw (d) a tap handle
  15. 15.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
  16. 16.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) True (b) False
  17. 17.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
  18. 18.⚙️ Which simple machine is a tap handle? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
  19. 19.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) zero (c) bigger on the left (d) always 10
  20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) True (b) False
  21. 21.True or false: a flat table is needed for the ruler lever. (a) False (b) True
  22. 22.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) yeast (d) a 30 cm ruler
  23. 23.⚖️ 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 number of coins (c) which side goes down (d) the same ruler
  24. 24.🧺 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
  25. 25.True or false: a spoon lifting a lid is a wheel and axle. (a) True (b) False
  26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
  27. 27.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
  28. 28.⚖️ 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 measure it (c) we change it
  29. 29.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  30. 30.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) jump up and down (d) sit closer to middle
  31. 31.⚖️ 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) where the pencil is (c) distance from the pencil (d) which side goes down
  32. 32.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
  33. 33.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
  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.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
  36. 36.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the axle (d) the fulcrum
  37. 37.⚖️ 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 change it (b) we keep it the same (c) we measure it
  38. 38.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
  39. 39.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a battery cell (c) a flat table (d) a 30 cm ruler
  40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a balloon (c) coins of one kind (d) a flat table

Answer key

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

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