Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 911 · 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.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
3. 3.⚖️ 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 kind of coins (c) the same ruler (d) the number of coins
4. 4.True or false: a magnet is needed for the ruler lever. (a) True (b) False
5. 5.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) turmeric powder (d) a magnet
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 kind of coins (b) which side goes down (c) the number of coins (d) the same ruler
7. 7.⚙️ Which of these is a lever? (a) a crane (b) a see-saw (c) a ramp (d) a steering wheel
8. 8.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
9. 9.🔮 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) neither, it balances (c) the left side (d) the right side
10. 10.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a 30 cm ruler (d) turmeric powder
11. 11.⚙️ Which of these uses a pulley? (a) a sloping road (b) a well pulley (c) a ramp (d) a steering wheel
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 10 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
13. 13.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too shiny (d) they are too cold
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a balloon (c) a flat table (d) a 30 cm ruler
15. 15.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) turmeric powder (c) a battery cell (d) a balloon
16. 16.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
17. 17.🧺 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 battery cell
18. 18.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
19. 19.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a sloping road (c) a steering wheel (d) a crowbar
20. 20.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
21. 21.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
22. 22.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) jump up and down (d) sit farther from middle
23. 23.True or false: a bottle opener is an inclined plane. (a) True (b) False
24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) False (b) True
25. 25.⚙️ Which of these is a lever? (a) a sloping road (b) a crane (c) a bottle opener (d) a well pulley
26. 26.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
27. 27.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
29. 29.True or false: a slide is an inclined plane. (a) False (b) True
30. 30.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
31. 31.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 5 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
33. 33.🧺 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
34. 34.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) press it gently (d) stand on the ruler
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
36. 36.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
37. 37.⚖️ 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 same ruler (b) which side goes down (c) distance from the pencil
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 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?
39. 39.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) always 10 (d) equal on both sides
40. 40.True or false: a flagpole uses a pulley. (a) False (b) True

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