Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 695 · 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.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) sit closer to middle (d) jump up and down
2. 2.⚖️ 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 measure it (b) we change it (c) we keep it the same
3. 3.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) coins of one kind (c) turmeric powder (d) a magnet
4. 4.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
6. 6.🧺 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 magnet (d) coins of one kind
7. 7.⚖️ 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 number of coins (b) distance from the pencil (c) which side goes down (d) the same ruler
8. 8.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
9. 9.⚙️ Which of these uses a pulley? (a) a see-saw (b) a slide (c) a flagpole (d) a spoon lifting a lid
10. 10.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
11. 11.True or false: a doorknob is a wheel and axle. (a) False (b) True
12. 12.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a mirror (c) a flat table (d) coins of one kind
14. 14.True or false: a bottle opener uses a pulley. (a) True (b) False
15. 15.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a balloon (d) a 30 cm ruler
16. 16.True or false: a well pulley is a lever. (a) False (b) True
17. 17.⚙️ Which of these is a wheel and axle? (a) a slide (b) a crane (c) a crowbar (d) a tap handle
18. 18.True or false: a spoon lifting a lid is a lever. (a) False (b) True
19. 19.⚖️ 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
20. 20.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
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) which side goes down (b) distance from the pencil (c) the number of coins
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
23. 23.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
24. 24.🔮 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) the right side (c) the left side (d) both go up
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
26. 26.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
27. 27.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
28. 28.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
29. 29.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
30. 30.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we measure it (b) we keep it the same (c) we change it
32. 32.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a mirror (c) a balloon (d) a flat table
33. 33.⚙️ Which simple machine is a tap handle? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
34. 34.⚖️ 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 12 cm to the right to balance it?
35. 35.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they are too shiny (d) they may swallow them
36. 36.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
37. 37.⚙️ Which of these is a wheel and axle? (a) a crane (b) a doorknob (c) a ramp (d) a crowbar
38. 38.⚙️ Which simple machine is a doorknob? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
39. 39.True or false: a spoon lifting a lid is a wheel and axle. (a) True (b) False
40. 40.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False

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