Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 89 · 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.True or false: a crowbar is a lever. (a) False (b) True
2. 2.True or false: a sloping road is an inclined plane. (a) False (b) True
3. 3.True or false: a see-saw uses a pulley. (a) True (b) False
4. 4.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
5. 5.True or false: a see-saw is a wheel and axle. (a) True (b) False
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) distance from the pencil (c) the same ruler
7. 7.⚖️ 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?
8. 8.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they may swallow them (d) they are magnetic
9. 9.⚖️ 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
10. 10.⚖️ 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?
11. 11.True or false: a tap handle is a wheel and axle. (a) True (b) False
12. 12.⚖️ 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 change it (b) we measure it (c) we keep it the same
13. 13.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the axle (d) the fulcrum
14. 14.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) bend it till it snaps (d) stand on the ruler
15. 15.⚖️ 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 measure it (b) we keep it the same (c) we change it
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 1 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
19. 19.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
20. 20.⚖️ 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) True (b) False
21. 21.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
22. 22.⚖️ 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 kind of coins (b) distance from the pencil (c) the same ruler (d) where the pencil is
23. 23.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
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 the one thing we change. (a) True (b) False
25. 25.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a battery cell (d) a 30 cm ruler
27. 27.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a magnet (d) coins of one kind
28. 28.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
29. 29.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a steering wheel (c) a ramp (d) a well pulley
30. 30.⚙️ Which simple machine is a crane? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
31. 31.⚙️ Which of these uses a pulley? (a) a sloping road (b) a ramp (c) a flagpole (d) a tap handle
32. 32.⚖️ 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 number of coins (c) which side goes down (d) the kind of coins
33. 33.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
34. 34.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) turmeric powder (d) coins of one kind
35. 35.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 5 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
36. 36.True or false: a spoon lifting a lid is a lever. (a) True (b) False
37. 37.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) turmeric powder (c) a battery cell (d) a balloon
38. 38.⚙️ Which of these is a lever? (a) a crowbar (b) a well pulley (c) a doorknob (d) a tap handle
39. 39.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a balloon (c) a 30 cm ruler (d) a flat table
40. 40.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a magnet (c) a mirror (d) a flat table

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