Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 224 · 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.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
2. 2.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
3. 3.True or false: a bottle opener uses a pulley. (a) False (b) True
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a round pencil (c) a flat table (d) coins of one kind
5. 5.True or false: a balloon is needed for the ruler lever. (a) False (b) True
6. 6.🧺 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) a 30 cm ruler
7. 7.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the fulcrum (d) the load
8. 8.🔮 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
9. 9.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) jump up and down (d) sit farther from middle
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
11. 11.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we keep it the same (b) we measure it (c) we change it
12. 12.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
13. 13.True or false: a doorknob is a lever. (a) False (b) True
14. 14.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a ramp (c) a doorknob (d) a bottle opener
15. 15.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
16. 16.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
17. 17.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is magnetic (c) the spoon is hot (d) a lever boosts your push
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 measure it (b) we keep it the same (c) we change it
19. 19.🛟 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
20. 20.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
21. 21.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
22. 22.🧺 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 round pencil (d) a magnet
23. 23.True or false: yeast is needed for the ruler lever. (a) False (b) True
24. 24.True or false: a see-saw is a lever. (a) True (b) False
25. 25.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) impossible (d) the same
26. 26.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a balloon (c) a battery cell (d) a round pencil
27. 27.⚖️ 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 change it (b) we measure it (c) we keep it the same
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 1 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
29. 29.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
30. 30.⚖️ 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) where the pencil is (c) distance from the pencil
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
32. 32.⚙️ Which of these is a lever? (a) a crowbar (b) a flagpole (c) a sloping road (d) a doorknob
33. 33.⚖️ 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) which side goes down (b) the same ruler (c) where the pencil is (d) distance from the pencil
34. 34.True or false: a bottle opener is a lever. (a) True (b) False
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a battery cell (d) a 30 cm ruler
36. 36.⚙️ Which of these uses a pulley? (a) a tap handle (b) a well pulley (c) a doorknob (d) a spoon lifting a lid
37. 37.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
38. 38.⚙️ Which simple machine is a sloping road? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 10 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?
40. 40.⚙️ Which simple machine is a steering wheel? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever

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