Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 910 · 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.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) the number of coins (c) which side goes down (d) the kind of coins
2. 2.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
3. 3.⚖️ 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) a lever boosts your push (d) the spoon is magnetic
4. 4.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a ramp (c) a bottle opener (d) a see-saw
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) the right side (d) both go up
6. 6.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
7. 7.⚖️ 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
8. 8.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
9. 9.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a ramp (c) a see-saw (d) a bottle opener
10. 10.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a slide (c) a steering wheel (d) a tap handle
11. 11.🧺 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 round pencil
12. 12.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a sloping road (c) a crowbar (d) a steering wheel
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 same ruler (c) where the pencil is (d) distance from the pencil
14. 14.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) bigger on the left (c) zero (d) always 10
15. 15.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
16. 16.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
17. 17.🛟 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
18. 18.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
19. 19.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a balloon (c) turmeric powder (d) coins of one kind
20. 20.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit on the middle (d) sit farther from middle
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a mirror (d) coins of one kind
22. 22.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
24. 24.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are too cold (d) they are magnetic
25. 25.⚖️ 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
26. 26.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
27. 27.⚖️ 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) False (b) True
28. 28.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) coins of one kind (d) a round pencil
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 6 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?
31. 31.⚖️ 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 measure it (b) we change it (c) we keep it the same
32. 32.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) coins of one kind (c) a round pencil (d) a 30 cm ruler
33. 33.⚖️ 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
34. 34.True or false: a magnet is needed for the ruler lever. (a) False (b) True
35. 35.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 5 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
36. 36.⚖️ 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?
37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
38. 38.True or false: a spoon lifting a lid is a wheel and axle. (a) False (b) True
39. 39.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
40. 40.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False

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