Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 189 · 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.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
2. 2.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the effort (d) the axle
3. 3.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) stand on the ruler (d) bend it till it snaps
4. 4.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a balloon (c) a 30 cm ruler (d) coins of one kind
6. 6.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) impossible (d) the same
7. 7.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
8. 8.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they may swallow them (d) they are too shiny
9. 9.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) turmeric powder (c) a magnet (d) yeast
10. 10.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
11. 11.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
12. 12.🧺 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 30 cm ruler (d) a magnet
13. 13.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
14. 14.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a balloon (c) yeast (d) coins of one kind
15. 15.⚙️ Which of these is a lever? (a) a slide (b) a ramp (c) a spoon lifting a lid (d) a crane
16. 16.⚙️ Which of these is a wheel and axle? (a) a well pulley (b) a bottle opener (c) a ramp (d) a doorknob
17. 17.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) the kind of coins (c) where the pencil is (d) distance from the pencil
18. 18.⚙️ Which of these is an inclined plane? (a) a ramp (b) a flagpole (c) a doorknob (d) a see-saw
19. 19.True or false: a mirror is needed for the ruler lever. (a) False (b) True
20. 20.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a 30 cm ruler (d) a mirror
21. 21.True or false: a see-saw is a lever. (a) False (b) True
22. 22.🔮 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) neither, it balances (c) the left side (d) the right side
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
24. 24.⚖️ 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
25. 25.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) a magnet (d) a 30 cm ruler
26. 26.True or false: a crane uses a pulley. (a) True (b) False
27. 27.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we change it (b) we keep it the same (c) we measure it
29. 29.⚙️ Which of these is a lever? (a) a slide (b) a crowbar (c) a sloping road (d) a well pulley
30. 30.⚖️ 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 change it (c) we measure it
31. 31.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
32. 32.True or false: a well pulley is a lever. (a) False (b) True
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) a battery cell
34. 34.⚖️ 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
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) where the pencil is (b) distance from the pencil (c) which side goes down
36. 36.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
37. 37.🧺 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 round pencil
38. 38.True or false: a sloping road is an inclined plane. (a) True (b) False
39. 39.⚖️ 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) False (b) True
40. 40.⚖️ 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) False (b) True

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