Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 425 · 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.⚙️ Which of these is a lever? (a) a steering wheel (b) a flagpole (c) a doorknob (d) a spoon lifting a lid
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
3. 3.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a flat table (c) a round pencil (d) coins of one kind
4. 4.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit farther from middle (d) sit on the middle
5. 5.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
6. 6.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
7. 7.⚙️ Which of these is a lever? (a) a see-saw (b) a well pulley (c) a steering wheel (d) a flagpole
8. 8.⚖️ 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) True (b) False
9. 9.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a battery cell (c) turmeric powder (d) coins of one kind
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a balloon (c) a round pencil (d) a flat table
11. 11.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
12. 12.⚖️ 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
13. 13.True or false: a tap handle is an inclined plane. (a) False (b) True
14. 14.🔮 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 right side (b) the left side (c) both go up (d) neither, it balances
15. 15.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
16. 16.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a flat table (c) a round pencil (d) a 30 cm ruler
18. 18.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a steering wheel (c) a flagpole (d) a crowbar
19. 19.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) stand on the ruler (d) press it gently
20. 20.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) turmeric powder (c) a magnet (d) a battery cell
21. 21.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) a round pencil (c) a 30 cm ruler (d) coins of one kind
22. 22.⚙️ Which simple machine is a doorknob? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
23. 23.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) bigger on the left (d) always 10
24. 24.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
25. 25.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a 30 cm ruler (c) turmeric powder (d) a magnet
26. 26.⚖️ 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
27. 27.True or false: a doorknob is an inclined plane. (a) False (b) True
28. 28.True or false: a slide is an inclined plane. (a) False (b) True
29. 29.True or false: a well pulley uses a pulley. (a) False (b) True
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) True (b) False
31. 31.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a bottle opener (c) a ramp (d) a sloping road
32. 32.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a battery cell (c) a 30 cm ruler (d) coins of one kind
33. 33.⚖️ 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) distance from the pencil (c) the kind of coins (d) the number of coins
34. 34.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
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.True or false: a sloping road is a lever. (a) False (b) True
37. 37.True or false: yeast is needed for the ruler lever. (a) True (b) False
38. 38.True or false: a see-saw is a lever. (a) True (b) False
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
40. 40.True or false: a bottle opener uses a pulley. (a) True (b) False

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