Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 413 · 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? What do we do with “the number of coins”? (a) we measure it (b) we keep it the same (c) we change it
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
3. 3.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a crowbar (c) a slide (d) a bottle opener
4. 4.⚖️ 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
5. 5.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
6. 6.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) a magnet
7. 7.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a mirror (c) a battery cell (d) a magnet
8. 8.⚙️ Which simple machine is a crane? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
9. 9.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
10. 10.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) bigger on the left (d) equal on both sides
11. 11.⚖️ 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) where the pencil is (c) distance from the pencil
12. 12.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a magnet (c) a balloon (d) coins of one kind
13. 13.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) flick coins at faces (d) bend it till it snaps
14. 14.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
15. 15.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a crane (c) a bottle opener (d) a doorknob
16. 16.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
17. 17.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a magnet (c) a mirror (d) a flat table
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
19. 19.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
20. 20.⚙️ Which of these uses a pulley? (a) a ramp (b) a well pulley (c) a steering wheel (d) a crowbar
21. 21.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a round pencil (c) a magnet (d) a mirror
22. 22.🧺 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) turmeric powder
23. 23.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a balloon (d) a 30 cm ruler
24. 24.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) a lever boosts your push (c) the spoon is hot (d) the lid gets softer
25. 25.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible
26. 26.⚖️ 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
27. 27.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit closer to middle (c) jump up and down (d) sit on the middle
28. 28.True or false: a battery cell is needed for the ruler lever. (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 “which side goes down”? (a) we keep it the same (b) we change it (c) we measure it
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 3 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
31. 31.True or false: yeast is needed for the ruler lever. (a) False (b) True
32. 32.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a balloon (d) a flat table
34. 34.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
35. 35.⚙️ Which simple machine is a sloping road? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
36. 36.⚙️ Which of these is a lever? (a) a slide (b) a crane (c) a ramp (d) a spoon lifting a lid
37. 37.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
38. 38.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they are too shiny (d) they may swallow them
39. 39.⚖️ 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
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) yeast (d) a flat table

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