Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 663 · 40 questions

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.

1. 1.⚖️ 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?
2. 2.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) jump up and down (d) sit closer to middle
3. 3.True or false: a crane is a lever. (a) False (b) True
4. 4.⚙️ Which simple machine is a crowbar? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
5. 5.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 8 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
7. 7.⚖️ 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) where the pencil is (b) the same ruler (c) the number of coins (d) distance from the pencil
8. 8.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a flagpole (c) a crane (d) a doorknob
9. 9.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) yeast (c) a 30 cm ruler (d) coins of one kind
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 the one thing we change. (a) False (b) True
11. 11.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) bigger on the left (d) always 10
12. 12.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) True (b) False
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 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?
14. 14.🔮 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
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) a battery cell
16. 16.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
17. 17.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
18. 18.⚖️ 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 measure it (b) we keep it the same (c) we change it
19. 19.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
20. 20.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) the spoon is magnetic (d) a lever boosts your push
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
22. 22.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
23. 23.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) easier (d) impossible
24. 24.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) turmeric powder (c) a flat table (d) a round pencil
25. 25.True or false: a ramp is a lever. (a) False (b) True
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 6 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) which side goes down (b) distance from the pencil (c) the kind of coins
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 3 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
29. 29.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a sloping road (c) a see-saw (d) a steering wheel
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 3 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a flat table (c) coins of one kind (d) a 30 cm ruler
32. 32.True or false: a steering wheel is an inclined plane. (a) False (b) True
33. 33.⚖️ 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 keep it the same (c) we measure it
34. 34.⚖️ 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
35. 35.⚙️ Which simple machine is a ramp? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
36. 36.⚖️ 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 number of coins (b) the same ruler (c) distance from the pencil (d) which side goes down
37. 37.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) turmeric powder (c) a mirror (d) a balloon
38. 38.⚖️ 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
39. 39.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
40. 40.⚖️ 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

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