Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 291 · 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.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “distance from the pencil”? (a) we measure it (b) we change it (c) we keep it the same
2. 2.⚖️ 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 change it (b) we keep it the same (c) we measure it
3. 3.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a round pencil (d) a mirror
4. 4.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too shiny (c) they are too cold (d) they are magnetic
5. 5.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) the same (d) impossible
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) False (b) True
7. 7.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
8. 8.True or false: a sloping road is a wheel and axle. (a) True (b) False
9. 9.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) turmeric powder (c) a magnet (d) a flat table
10. 10.⚙️ Which of these uses a pulley? (a) a crane (b) a doorknob (c) a see-saw (d) a bottle opener
11. 11.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
12. 12.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
13. 13.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
14. 14.True or false: a mirror is needed for the ruler lever. (a) False (b) True
15. 15.⚙️ Which of these uses a pulley? (a) a well pulley (b) a steering wheel (c) a see-saw (d) a doorknob
16. 16.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) a lever boosts your push (c) the lid gets softer (d) the spoon is magnetic
17. 17.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a mirror (d) a round pencil
18. 18.🔮 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) neither, it balances (c) both go up (d) the left side
19. 19.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a battery cell (c) a 30 cm ruler (d) a magnet
20. 20.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a flat table (c) a 30 cm ruler (d) a round pencil
22. 22.⚙️ Which simple machine is a flagpole? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
24. 24.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
25. 25.True or false: a crane uses a pulley. (a) True (b) False
26. 26.⚖️ 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 4 cm to the right to balance it?
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 5 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
28. 28.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a mirror (c) a round pencil (d) coins of one kind
30. 30.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) press it gently (d) bend it till it snaps
31. 31.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) bigger on the left (c) always 10 (d) zero
32. 32.⚖️ 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) distance from the pencil (d) the kind of coins
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) yeast (c) coins of one kind (d) a round pencil
34. 34.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
35. 35.⚖️ 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?
36. 36.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
37. 37.⚙️ Which simple machine is a slide? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
38. 38.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a balloon (d) a round pencil
39. 39.True or false: a flat table is needed for the ruler lever. (a) True (b) False
40. 40.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a spoon lifting a lid (c) a crowbar (d) a flagpole

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