Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 193 · 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 flat table for the ruler lever? (a) needed (b) not needed
2. 2.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) sit farther from middle (d) jump up and down
3. 3.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
4. 4.True or false: a flagpole is a lever. (a) True (b) False
5. 5.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
6. 6.⚖️ 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) where the pencil is (c) the same ruler (d) which side goes down
7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) harder (d) easier
8. 8.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) coins of one kind (d) yeast
10. 10.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are magnetic (d) they are too shiny
11. 11.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
12. 12.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
13. 13.⚖️ 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 change it (c) we keep it the same
14. 14.⚙️ Which of these is a wheel and axle? (a) a flagpole (b) a well pulley (c) a ramp (d) a doorknob
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a balloon (d) a round pencil
16. 16.True or false: a flat table is needed for the ruler lever. (a) False (b) True
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
18. 18.True or false: a crane is a lever. (a) True (b) False
19. 19.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a magnet (d) a mirror
20. 20.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a magnet (c) turmeric powder (d) coins of one kind
21. 21.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) a battery cell
22. 22.True or false: a mirror is needed for the ruler lever. (a) True (b) False
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 12 cm to the left of the pencil. How many coins must you place 12 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 “where the pencil is”? (a) we keep it the same (b) we change it (c) we measure it
25. 25.⚙️ Which of these uses a pulley? (a) a ramp (b) a spoon lifting a lid (c) a crane (d) a bottle opener
26. 26.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a ramp (c) a steering wheel (d) a tap handle
27. 27.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
28. 28.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) coins of one kind (c) a 30 cm ruler (d) a flat table
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
31. 31.⚙️ Which simple machine is a doorknob? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
32. 32.⚖️ 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) distance from the pencil (b) the number of coins (c) the same ruler (d) the kind of coins
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) a magnet
34. 34.⚙️ Which of these is a lever? (a) a flagpole (b) a ramp (c) a steering wheel (d) a bottle opener
35. 35.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
36. 36.⚖️ 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
37. 37.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) bigger on the left (c) zero (d) always 10
38. 38.⚙️ Which simple machine is a steering wheel? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
39. 39.True or false: a see-saw is a lever. (a) False (b) True
40. 40.⚙️ Which of these uses a pulley? (a) a tap handle (b) a crowbar (c) a doorknob (d) a well pulley

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