Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 72 · 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.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) turmeric powder
3. 3.🧺 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 magnet
4. 4.True or false: a steering wheel is a wheel and axle. (a) True (b) False
5. 5.True or false: a mirror is needed for the ruler lever. (a) True (b) False
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
7. 7.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are too cold (d) they are magnetic
8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) coins of one kind (d) a mirror
9. 9.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
10. 10.True or false: a sloping road is an inclined plane. (a) False (b) True
11. 11.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
12. 12.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) jump up and down (c) sit farther from middle (d) sit closer to middle
13. 13.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a round pencil (d) a balloon
14. 14.⚖️ 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 number of coins (b) distance from the pencil (c) the kind of coins (d) which side goes down
15. 15.🔮 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) neither, it balances (d) the right side
16. 16.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
17. 17.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) equal on both sides (d) bigger on the left
18. 18.True or false: a flagpole uses a pulley. (a) True (b) False
19. 19.⚙️ Which simple machine is a well pulley? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
20. 20.⚖️ 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) False (b) True
21. 21.⚙️ Which of these is a lever? (a) a crane (b) a see-saw (c) a tap handle (d) a ramp
22. 22.True or false: a slide uses a pulley. (a) True (b) False
23. 23.⚖️ 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 same ruler (b) where the pencil is (c) the kind of coins (d) distance from the pencil
24. 24.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a slide (c) a see-saw (d) a well pulley
25. 25.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
26. 26.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a battery cell (c) a round pencil (d) coins of one kind
27. 27.⚖️ 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 number of coins (b) distance from the pencil (c) which side goes down
28. 28.⚖️ 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 keep it the same (b) we measure it (c) we change it
29. 29.⚙️ Which simple machine is a crowbar? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
30. 30.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) bend it till it snaps (d) press it gently
31. 31.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a balloon (c) turmeric powder (d) coins of one kind
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
33. 33.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a battery cell (c) a mirror (d) a round pencil
34. 34.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) coins of one kind (d) a flat table
35. 35.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
36. 36.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
37. 37.True or false: a crowbar is a lever. (a) True (b) False
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
39. 39.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a magnet (c) a 30 cm ruler (d) a balloon
40. 40.True or false: a ramp is an inclined plane. (a) False (b) True

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