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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 555 · 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.

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  1. 1.🧺 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 balloon
  2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a flat table (d) yeast
  3. 3.🛟 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
  4. 4.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a see-saw (c) a ramp (d) a flagpole
  5. 5.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a tap handle (c) a bottle opener (d) a ramp
  6. 6.⚖️ 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 kind of coins (c) distance from the pencil (d) the number of coins
  7. 7.⚖️ 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
  8. 8.⚖️ 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) True (b) False
  9. 9.True or false: a bottle opener is a lever. (a) True (b) False
  10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False
  11. 11.🔮 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) both go up (c) neither, it balances (d) the right side
  12. 12.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a flagpole (c) a spoon lifting a lid (d) a steering wheel
  13. 13.⚖️ 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) False (b) True
  14. 14.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
  15. 15.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
  16. 16.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a magnet (d) a flat table
  17. 17.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
  18. 18.⚙️ Which simple machine is a ramp? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
  19. 19.🧺 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 round pencil (d) turmeric powder
  20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) where the pencil is (c) the number of coins (d) the same ruler
  21. 21.⚖️ 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) False (b) True
  22. 22.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  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 the one thing we change. (a) False (b) True
  24. 24.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
  25. 25.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 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?
  26. 26.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they are too cold (d) they may swallow them
  27. 27.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
  28. 28.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  29. 29.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
  30. 30.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a mirror (c) a 30 cm ruler (d) a flat table
  31. 31.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) sit closer to middle (d) jump up and down
  32. 32.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
  33. 33.⚖️ 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 kind of coins
  34. 34.True or false: a mirror is needed for the ruler lever. (a) False (b) True
  35. 35.⚖️ 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) False (b) True
  36. 36.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
  37. 37.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
  38. 38.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) turmeric powder (d) coins of one kind
  39. 39.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a mirror (c) a 30 cm ruler (d) coins of one kind
  40. 40.⚖️ 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 change it (b) we measure it (c) we keep it the same

Answer key

  1. a balloon
  2. yeast
  3. press it gently
  4. a flagpole
  5. a ramp
  6. distance from the pencil
  7. we keep it the same
  8. False
  9. True
  10. False
  11. the right side
  12. a steering wheel
  13. True
  14. False
  15. 5
  16. a magnet
  17. a lever
  18. an inclined plane
  19. turmeric powder
  20. which side goes down
  21. False
  22. 6
  23. False
  24. 2
  25. 2
  26. they may swallow them
  27. 2
  28. 3
  29. True
  30. a mirror
  31. sit farther from middle
  32. 4
  33. the kind of coins
  34. False
  35. True
  36. False
  37. needed
  38. turmeric powder
  39. a mirror
  40. we keep it the same

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