Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 557 · 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 round pencil (b) coins of one kind (c) a mirror (d) a 30 cm ruler
2. 2.⚙️ Which of these uses a pulley? (a) a see-saw (b) a bottle opener (c) a crane (d) a doorknob
3. 3.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) turmeric powder
4. 4.⚙️ Which of these uses a pulley? (a) a see-saw (b) a bottle opener (c) a flagpole (d) a steering wheel
5. 5.⚙️ Which simple machine is a crane? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
6. 6.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) press it gently (d) flick coins at faces
7. 7.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a well pulley (c) a bottle opener (d) a spoon lifting a lid
8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) False (b) True
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) the kind of coins (c) where the pencil is (d) the same ruler
11. 11.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the spoon is hot (c) a lever boosts your push (d) the lid gets softer
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) coins of one kind (c) a 30 cm ruler (d) a flat table
13. 13.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
15. 15.⚙️ Which simple machine is a bottle opener? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
16. 16.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
18. 18.⚖️ 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 measure it (b) we keep it the same (c) we change it
19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a battery cell (c) a flat table (d) a round pencil
20. 20.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) zero (c) always 10 (d) bigger on the left
21. 21.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
22. 22.True or false: a tap handle uses a pulley. (a) True (b) False
23. 23.True or false: a flagpole uses a pulley. (a) True (b) False
24. 24.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
25. 25.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) turmeric powder (c) a battery cell (d) a 30 cm ruler
26. 26.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 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?
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
29. 29.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a slide (c) a tap handle (d) a sloping road
30. 30.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a balloon (d) a 30 cm ruler
32. 32.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
33. 33.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
34. 34.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
35. 35.True or false: coins of one kind is not 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? True or false: distance from the pencil is the one thing we change. (a) True (b) False
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
38. 38.⚙️ Which simple machine is a tap handle? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
39. 39.⚖️ 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
40. 40.⚖️ 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 6 cm to the right to balance it?

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