Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 995 · 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) needed (b) not needed
2. 2.⚙️ Which simple machine is a steering wheel? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
3. 3.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit on the middle (c) sit farther from middle (d) sit closer to middle
4. 4.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) turmeric powder (d) a 30 cm ruler
5. 5.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) yeast (c) a magnet (d) a mirror
6. 6.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
7. 7.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) always 10 (c) zero (d) equal on both sides
8. 8.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
9. 9.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
10. 10.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
11. 11.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) coins of one kind (c) yeast (d) turmeric powder
12. 12.⚙️ Which of these uses a pulley? (a) a doorknob (b) a steering wheel (c) a flagpole (d) a see-saw
13. 13.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
14. 14.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a magnet (d) a round pencil
15. 15.⚙️ Which of these uses a pulley? (a) a crane (b) a tap handle (c) a spoon lifting a lid (d) a ramp
16. 16.⚖️ 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
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
18. 18.True or false: a sloping road is an inclined plane. (a) False (b) True
19. 19.🔮 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) both go up (c) the left side (d) the right side
20. 20.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they are magnetic (d) they may swallow them
21. 21.True or false: a bottle opener uses a pulley. (a) True (b) False
22. 22.⚙️ Which of these is a lever? (a) a ramp (b) a crane (c) a flagpole (d) a bottle opener
23. 23.⚖️ 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 same ruler (b) distance from the pencil (c) which side goes down (d) the number of coins
24. 24.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) a balloon
26. 26.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) impossible (d) harder
27. 27.⚖️ 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
28. 28.🧺 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 mirror (d) a 30 cm ruler
29. 29.⚙️ Which of these is an inclined plane? (a) a slide (b) a spoon lifting a lid (c) a crowbar (d) a doorknob
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we measure it (b) we keep it the same (c) we change it
31. 31.⚖️ 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) which side goes down (c) the same ruler
32. 32.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) stand on the ruler (d) press it gently
33. 33.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) False (b) True
36. 36.⚖️ 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) True (b) False
37. 37.⚖️ 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
38. 38.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a crane (c) a see-saw (d) a doorknob
39. 39.True or false: a bottle opener is a lever. (a) True (b) False
40. 40.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a mirror (c) a round pencil (d) a balloon

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