Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 576 · 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.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) harder (d) the same
2. 2.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) equal on both sides (c) bigger on the left (d) zero
3. 3.⚖️ 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 keep it the same (c) we change it
4. 4.⚖️ 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
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) yeast (c) coins of one kind (d) a 30 cm ruler
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) False (b) True
7. 7.⚙️ Which of these uses a pulley? (a) a doorknob (b) a spoon lifting a lid (c) a well pulley (d) a tap handle
8. 8.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a flat table (d) a balloon
9. 9.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) yeast (c) a magnet (d) a round pencil
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the same ruler (b) the kind of coins (c) distance from the pencil (d) which side goes down
11. 11.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a mirror (c) coins of one kind (d) a magnet
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 10 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
13. 13.⚖️ 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) True (b) False
14. 14.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they are too shiny (d) they may swallow them
15. 15.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
16. 16.True or false: a flat table is needed for the ruler lever. (a) False (b) True
17. 17.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) bend it till it snaps (c) stand on the ruler (d) flick coins at faces
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a flat table (c) coins of one kind (d) a 30 cm ruler
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
20. 20.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) coins of one kind (d) a flat table
21. 21.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a battery cell
22. 22.True or false: a sloping road is a wheel and axle. (a) True (b) False
23. 23.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
24. 24.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
25. 25.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
26. 26.⚖️ 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) where the pencil is (c) distance from the pencil (d) the number of coins
27. 27.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
28. 28.⚙️ Which of these is an inclined plane? (a) a slide (b) a see-saw (c) a well pulley (d) a spoon lifting a lid
29. 29.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
30. 30.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
31. 31.True or false: a flagpole is a wheel and axle. (a) True (b) False
32. 32.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
33. 33.True or false: a doorknob is a lever. (a) False (b) True
34. 34.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
35. 35.True or false: a balloon is needed for the ruler lever. (a) False (b) True
36. 36.🔮 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 left side (c) the right side (d) both go up
37. 37.⚖️ 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
38. 38.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the fulcrum (d) the load
39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) False (b) True
40. 40.⚙️ Which simple machine is a sloping road? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane

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