Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 420 · 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 of these is a lever? (a) a spoon lifting a lid (b) a well pulley (c) a flagpole (d) a ramp
2. 2.⚙️ Which simple machine is a slide? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
3. 3.True or false: a crowbar is a lever. (a) False (b) True
4. 4.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) flick coins at faces (d) press it gently
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) yeast (c) a 30 cm ruler (d) a flat table
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 12 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 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?
8. 8.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
9. 9.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a sloping road (c) a steering wheel (d) a see-saw
10. 10.⚖️ 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
11. 11.True or false: a magnet is needed for the ruler lever. (a) True (b) False
12. 12.⚙️ Which of these uses a pulley? (a) a see-saw (b) a well pulley (c) a doorknob (d) a bottle opener
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) False (b) True
14. 14.🧺 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 battery cell (d) a round pencil
15. 15.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
16. 16.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the load (d) the fulcrum
17. 17.⚙️ Which simple machine is a ramp? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
18. 18.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we keep it the same (b) we measure it (c) we change it
19. 19.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
20. 20.⚖️ 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 5 cm to the right to balance it?
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) distance from the pencil (b) which side goes down (c) the number of coins
22. 22.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
23. 23.True or false: yeast is needed for the ruler lever. (a) False (b) True
24. 24.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit on the middle (d) sit closer to middle
25. 25.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
26. 26.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
27. 27.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
28. 28.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
29. 29.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) both go up (c) the right side (d) the left side
30. 30.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
31. 31.⚙️ Which of these is an inclined plane? (a) a ramp (b) a well pulley (c) a see-saw (d) a crowbar
32. 32.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
33. 33.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a 30 cm ruler (c) a flat table (d) coins of one kind
34. 34.🧺 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) turmeric powder
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) the kind of coins (c) which side goes down (d) the number of coins
36. 36.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) bigger on the left (d) equal on both sides
37. 37.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) coins of one kind (c) yeast (d) turmeric powder
38. 38.True or false: a see-saw is a lever. (a) False (b) True
39. 39.True or false: a crowbar is a wheel and axle. (a) True (b) False
40. 40.⚖️ 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?

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