Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 363 · 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.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a flat table (c) coins of one kind (d) a round pencil
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
4. 4.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
5. 5.⚖️ 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 kind of coins (b) the number of coins (c) which side goes down (d) distance from the pencil
6. 6.True or false: a well pulley uses a pulley. (a) False (b) True
7. 7.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a flagpole (c) a slide (d) a see-saw
8. 8.⚖️ 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 kind of coins (b) distance from the pencil (c) the same ruler (d) the number of coins
9. 9.True or false: a bottle opener is a lever. (a) True (b) False
10. 10.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
11. 11.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
12. 12.True or false: a sloping road is an inclined plane. (a) False (b) True
13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a 30 cm ruler (c) a flat table (d) a round pencil
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a battery cell
15. 15.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
16. 16.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) the left side (c) the right side (d) neither, it balances
17. 17.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a flat table (c) a magnet (d) a mirror
18. 18.🧺 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
19. 19.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
20. 20.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) always 10 (d) zero
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
22. 22.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) turmeric powder (c) yeast (d) a 30 cm ruler
23. 23.⚖️ 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 change it (b) we measure it (c) we keep it the same
24. 24.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a magnet (c) a 30 cm ruler (d) a flat table
25. 25.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
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.⚖️ 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
28. 28.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) flick coins at faces (d) press it gently
29. 29.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
30. 30.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
31. 31.⚙️ Which simple machine is a ramp? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
32. 32.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
33. 33.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too shiny (d) they are too cold
34. 34.True or false: a crowbar is a lever. (a) False (b) True
35. 35.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) coins of one kind (c) turmeric powder (d) a balloon
36. 36.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the fulcrum (d) the load
37. 37.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
38. 38.⚙️ Which of these is a lever? (a) a slide (b) a crane (c) a see-saw (d) a flagpole
39. 39.True or false: a spoon lifting a lid uses a pulley. (a) True (b) False
40. 40.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed

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