Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 181 · 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.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too shiny (d) they are too cold
2. 2.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
3. 3.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a mirror (c) coins of one kind (d) turmeric powder
4. 4.⚖️ What is the turning point of a lever called? (a) the axle (b) the load (c) the fulcrum (d) the effort
5. 5.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) bend it till it snaps (d) stand on the ruler
6. 6.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) the right side (c) the left side (d) neither, it balances
7. 7.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a mirror (c) a flat table (d) yeast
8. 8.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) easier (d) impossible
9. 9.True or false: a ramp is a wheel and axle. (a) False (b) True
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) a magnet
11. 11.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
12. 12.⚖️ 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 number of coins (c) which side goes down (d) where the pencil is
13. 13.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a round pencil (d) a balloon
14. 14.⚖️ 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 keep it the same (b) we measure it (c) we change it
15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a round pencil (c) a 30 cm ruler (d) a flat table
16. 16.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
17. 17.⚖️ 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) False (b) True
18. 18.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
19. 19.True or false: a doorknob is a wheel and axle. (a) False (b) True
20. 20.⚖️ 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
21. 21.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a flat table (c) a round pencil (d) coins of one kind
22. 22.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) a magnet
23. 23.⚖️ 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
24. 24.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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.True or false: a doorknob is a lever. (a) False (b) True
27. 27.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
29. 29.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
30. 30.⚖️ 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 measure it (b) we keep it the same (c) we change it
31. 31.⚖️ 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) False (b) True
32. 32.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
33. 33.⚖️ 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
34. 34.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a doorknob (c) a see-saw (d) a flagpole
35. 35.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) bigger on the left (d) equal on both sides
36. 36.True or false: a tap handle is a wheel and axle. (a) False (b) True
37. 37.⚖️ 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?
38. 38.True or false: a doorknob uses a pulley. (a) False (b) True
39. 39.True or false: a balloon is needed for the ruler lever. (a) False (b) True
40. 40.True or false: a ramp is an inclined plane. (a) False (b) True

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