Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 471 · 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? True or false: the same ruler is kept the same. (a) False (b) True
2. 2.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
3. 3.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
4. 4.⚙️ Which of these is a lever? (a) a crane (b) a crowbar (c) a slide (d) a flagpole
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a balloon (c) a round pencil (d) coins of one kind
6. 6.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
7. 7.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a crane (c) a crowbar (d) a sloping road
8. 8.⚖️ 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
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a mirror (d) a round pencil
10. 10.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the spoon is magnetic (c) a lever boosts your push (d) the lid gets softer
11. 11.True or false: a magnet is needed for the ruler lever. (a) False (b) True
12. 12.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) easier (d) the same
13. 13.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they may swallow them (d) they are too cold
14. 14.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
15. 15.⚖️ 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
16. 16.⚙️ Which simple machine is a crowbar? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
17. 17.⚙️ Which of these uses a pulley? (a) a flagpole (b) a slide (c) a spoon lifting a lid (d) a sloping road
18. 18.⚙️ Which of these is a lever? (a) a tap handle (b) a spoon lifting a lid (c) a well pulley (d) a ramp
19. 19.⚖️ 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) distance from the pencil (c) which side goes down (d) the same ruler
20. 20.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a battery cell (c) a round pencil (d) turmeric powder
21. 21.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
22. 22.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) always 10 (d) bigger on the left
23. 23.True or false: a crane uses a pulley. (a) False (b) True
24. 24.⚖️ 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 change it (b) we measure it (c) we keep it the same
25. 25.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) turmeric powder (c) a round pencil (d) a flat table
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) the left side (b) neither, it balances (c) both go up (d) the right side
27. 27.True or false: a sloping road uses a pulley. (a) True (b) False
28. 28.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
29. 29.⚖️ 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
30. 30.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
32. 32.⚖️ 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 same ruler (b) which side goes down (c) distance from the pencil (d) the kind of coins
33. 33.⚖️ 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 change it (c) we keep it the same
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a magnet (d) a flat table
35. 35.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
36. 36.True or false: a mirror is needed for the ruler lever. (a) True (b) False
37. 37.True or false: a ramp uses a pulley. (a) True (b) False
38. 38.⚖️ 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) True (b) False
39. 39.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) jump up and down (d) sit closer to middle
40. 40.🛟 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

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