Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 641 · 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 mirror for the ruler lever? (a) needed (b) not needed
2. 2.⚖️ 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) where the pencil is (c) the same ruler (d) which side goes down
3. 3.🛟 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
4. 4.True or false: a doorknob is a wheel and axle. (a) False (b) True
5. 5.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) coins of one kind (d) a magnet
6. 6.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a balloon
7. 7.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) zero (d) bigger on the left
8. 8.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
9. 9.⚖️ 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) True (b) False
10. 10.True or false: a crowbar uses a pulley. (a) False (b) True
11. 11.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) False (b) True
12. 12.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) False (b) True
14. 14.True or false: a bottle opener is an inclined plane. (a) True (b) False
15. 15.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a balloon (d) coins of one kind
16. 16.⚖️ 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 change it (c) we keep it the same
17. 17.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
18. 18.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the right side (c) both go up (d) the left side
19. 19.⚖️ 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
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
21. 21.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a mirror (c) coins of one kind (d) a balloon
22. 22.⚖️ 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 keep it the same (c) we measure it
23. 23.True or false: a see-saw uses a pulley. (a) False (b) True
24. 24.True or false: a steering wheel is a wheel and axle. (a) True (b) False
25. 25.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
26. 26.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
27. 27.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
28. 28.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
29. 29.⚙️ Which of these is a lever? (a) a bottle opener (b) a well pulley (c) a flagpole (d) a sloping road
30. 30.True or false: a slide is an inclined plane. (a) True (b) False
31. 31.⚙️ Which of these uses a pulley? (a) a slide (b) a crane (c) a sloping road (d) a crowbar
32. 32.True or false: a tap handle is an inclined plane. (a) False (b) True
33. 33.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a flat table (c) a balloon (d) a magnet
34. 34.⚖️ 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) distance from the pencil (c) where the pencil is
35. 35.⚙️ Which of these is a wheel and axle? (a) a slide (b) a crowbar (c) a steering wheel (d) a crane
36. 36.⚙️ Which of these uses a pulley? (a) a bottle opener (b) a slide (c) a spoon lifting a lid (d) a flagpole
37. 37.⚖️ 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
38. 38.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
39. 39.⚙️ Which simple machine is a ramp? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
40. 40.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the spoon is hot (c) the lid gets softer (d) the spoon is magnetic

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