Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 875 · 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.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
3. 3.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) stand on the ruler (d) bend it till it snaps
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) yeast (d) coins of one kind
5. 5.🔮 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) neither, it balances (d) the left side
6. 6.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
8. 8.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
9. 9.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
10. 10.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a magnet
11. 11.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit closer to middle (c) jump up and down (d) sit on the middle
12. 12.⚙️ Which simple machine is a slide? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
13. 13.True or false: a spoon lifting a lid uses a pulley. (a) True (b) False
14. 14.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
15. 15.True or false: a well pulley uses a pulley. (a) False (b) True
16. 16.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
17. 17.⚖️ 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 change it (c) we measure it
18. 18.True or false: a slide is an inclined plane. (a) False (b) True
19. 19.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 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?
21. 21.🧺 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 balloon (d) a flat table
22. 22.⚖️ 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?
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
24. 24.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
25. 25.True or false: a tap handle uses a pulley. (a) False (b) True
26. 26.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a balloon (d) a flat table
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a round pencil (c) a flat table (d) coins of one kind
28. 28.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
29. 29.True or false: a sloping road is an inclined plane. (a) False (b) True
30. 30.🧺 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
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
32. 32.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) bigger on the left (d) zero
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
34. 34.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
35. 35.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
36. 36.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a battery cell (c) yeast (d) a magnet
37. 37.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
38. 38.⚙️ Which of these uses a pulley? (a) a flagpole (b) a spoon lifting a lid (c) a bottle opener (d) a slide
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) which side goes down (c) the same ruler
40. 40.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False

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