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Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 580 · 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? Which of these is what we measure? (a) the kind of coins (b) the same ruler (c) distance from the pencil (d) which side goes down
  2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) turmeric powder
  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 what we measure. (a) False (b) True
  4. 4.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 10 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
  5. 5.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) bend it till it snaps (d) stand on the ruler
  6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a round pencil (c) a flat table (d) coins of one kind
  7. 7.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 1 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
  8. 8.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
  9. 9.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) the spoon is magnetic (d) a lever boosts your push
  10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) a mirror
  11. 11.⚖️ 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
  12. 12.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a doorknob (c) a ramp (d) a crane
  13. 13.⚖️ 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) where the pencil is (d) distance from the pencil
  14. 14.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a magnet (c) a battery cell (d) coins of one kind
  15. 15.⚖️ 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 keep it the same (c) we measure it
  16. 16.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
  17. 17.⚙️ Which simple machine is a doorknob? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
  18. 18.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
  19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) the number of coins (c) distance from the pencil
  20. 20.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a magnet (c) a round pencil (d) a balloon
  21. 21.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
  22. 22.True or false: a magnet is needed for the ruler lever. (a) False (b) True
  23. 23.True or false: a ramp is an inclined plane. (a) False (b) True
  24. 24.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
  25. 25.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
  26. 26.🔮 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) both go up (d) the left side
  27. 27.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) a round pencil (d) a flat table
  28. 28.⚖️ 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
  29. 29.⚖️ 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 keep it the same (c) we measure it
  30. 30.⚖️ 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?
  31. 31.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
  32. 32.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
  33. 33.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
  34. 34.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
  35. 35.⚙️ Which of these uses a pulley? (a) a tap handle (b) a sloping road (c) a crane (d) a ramp
  36. 36.⚙️ Which simple machine is a crane? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
  37. 37.⚖️ 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?
  38. 38.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
  39. 39.⚙️ Which of these uses a pulley? (a) a tap handle (b) a flagpole (c) a steering wheel (d) a slide
  40. 40.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle

Answer key

  1. which side goes down
  2. turmeric powder
  3. False
  4. 5
  5. press it gently
  6. a balloon
  7. 1
  8. a lever
  9. a lever boosts your push
  10. a mirror
  11. True
  12. a doorknob
  13. distance from the pencil
  14. coins of one kind
  15. we change it
  16. not needed
  17. a wheel and axle
  18. 3
  19. the number of coins
  20. a round pencil
  21. not needed
  22. False
  23. True
  24. True
  25. 4
  26. the right side
  27. a battery cell
  28. True
  29. we keep it the same
  30. 5
  31. they may swallow them
  32. True
  33. True
  34. 2
  35. a crane
  36. a pulley
  37. 4
  38. not needed
  39. a flagpole
  40. the fulcrum

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