Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 28 · 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) a flat table (b) a round pencil (c) a 30 cm ruler (d) a balloon
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) yeast
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 1 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
4. 4.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
5. 5.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
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.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a round pencil (d) turmeric powder
9. 9.True or false: a ramp uses a pulley. (a) True (b) False
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a mirror (c) a flat table (d) a 30 cm ruler
11. 11.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) yeast
12. 12.True or false: a see-saw is a lever. (a) False (b) True
13. 13.⚖️ 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 keep it the same (b) we measure it (c) we change it
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 12 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
15. 15.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
16. 16.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
17. 17.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
18. 18.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the axle (d) the fulcrum
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 1 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
20. 20.⚙️ Which simple machine is a crane? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
21. 21.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a bottle opener (c) a see-saw (d) a ramp
22. 22.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) equal on both sides (d) always 10
23. 23.True or false: a flagpole uses a pulley. (a) False (b) True
24. 24.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
25. 25.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
26. 26.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) the spoon is magnetic (d) a lever boosts your push
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a magnet (d) a round pencil
28. 28.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a magnet (c) coins of one kind (d) a mirror
29. 29.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) flick coins at faces (d) bend it till it snaps
30. 30.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
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) True (b) False
33. 33.⚖️ 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 measure it (c) we keep it the same
34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) False (b) True
35. 35.True or false: yeast is needed for the ruler lever. (a) False (b) True
36. 36.⚖️ 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) the number of coins (c) which side goes down
37. 37.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
38. 38.True or false: a bottle opener is an inclined plane. (a) True (b) False
39. 39.⚖️ 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) the kind of coins (c) which side goes down
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) False (b) True

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