Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 547 · 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.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps
2. 2.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too cold (d) they are too shiny
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a flat table (d) a 30 cm ruler
4. 4.True or false: a ramp is an inclined plane. (a) False (b) True
5. 5.⚖️ 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) True (b) False
6. 6.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) sit farther from middle (d) jump up and down
7. 7.True or false: a magnet is needed for the ruler lever. (a) True (b) False
8. 8.True or false: a see-saw uses a pulley. (a) True (b) False
9. 9.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) the spoon is hot (d) a lever boosts your push
10. 10.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
11. 11.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
12. 12.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) easier (d) impossible
13. 13.True or false: a see-saw is a lever. (a) False (b) True
14. 14.⚖️ 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) the number of coins (c) which side goes down (d) distance from the pencil
15. 15.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
16. 16.⚖️ 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 number of coins (b) the same ruler (c) where the pencil is (d) which side goes down
17. 17.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the kind of coins (b) distance from the pencil (c) which side goes down
18. 18.True or false: a bottle opener uses a pulley. (a) False (b) True
19. 19.⚙️ Which simple machine is a doorknob? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) a magnet
21. 21.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) False (b) True
22. 22.⚖️ 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
23. 23.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
24. 24.⚙️ Which simple machine is a ramp? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
25. 25.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a doorknob (c) a slide (d) a steering wheel
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
27. 27.🔮 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 left side (c) both go up (d) the right side
28. 28.True or false: yeast is needed for the ruler lever. (a) False (b) True
29. 29.⚖️ 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
30. 30.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
31. 31.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
32. 32.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
33. 33.⚙️ Which simple machine is a crowbar? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
34. 34.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a spoon lifting a lid (c) a tap handle (d) a slide
35. 35.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) equal on both sides (c) zero (d) bigger on the left
36. 36.⚙️ Which simple machine is a tap handle? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
37. 37.⚖️ 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 change it (b) we keep it the same (c) we measure it
38. 38.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a battery cell (c) a magnet (d) a balloon
39. 39.True or false: a crowbar is a lever. (a) False (b) True
40. 40.⚖️ 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 measure it (c) we keep it the same

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