Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 849 · 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.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) the same (d) impossible
2. 2.⚖️ 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?
3. 3.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) press it gently (d) stand on the ruler
4. 4.True or false: a mirror is 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? True or false: where the pencil is is the one thing we change. (a) True (b) False
6. 6.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a sloping road (c) a crane (d) a steering wheel
7. 7.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) turmeric powder (d) a mirror
8. 8.⚖️ 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
9. 9.⚖️ 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
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) True (b) False
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a balloon
12. 12.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
13. 13.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a round pencil (c) coins of one kind (d) a flat table
14. 14.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) equal on both sides (d) bigger on the left
15. 15.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
16. 16.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a flat table (c) coins of one kind (d) a round pencil
17. 17.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
18. 18.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the load (d) the fulcrum
19. 19.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) turmeric powder (d) a round pencil
20. 20.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
21. 21.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the kind of coins (b) which side goes down (c) distance from the pencil
22. 22.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
23. 23.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
25. 25.⚖️ 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
26. 26.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
27. 27.True or false: a steering wheel is a wheel and axle. (a) False (b) True
28. 28.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a magnet (c) yeast (d) a round pencil
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
30. 30.⚖️ 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 number of coins (b) which side goes down (c) the same ruler (d) distance from the pencil
31. 31.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the right side (b) both go up (c) the left side (d) neither, it balances
32. 32.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
33. 33.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) True (b) False
34. 34.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) a lever boosts your push (c) the lid gets softer (d) the spoon is magnetic
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we measure it (b) we change it (c) we keep it the same
36. 36.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
37. 37.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit farther from middle (c) sit closer to middle (d) sit on the middle
38. 38.⚖️ 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
39. 39.⚙️ Which of these uses a pulley? (a) a slide (b) a bottle opener (c) a well pulley (d) a see-saw
40. 40.⚖️ 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?

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