Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 885 · 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.⚙️ Which simple machine is a flagpole? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
2. 2.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit closer to middle (c) sit on the middle (d) jump up and down
3. 3.⚙️ Which of these uses a pulley? (a) a see-saw (b) a steering wheel (c) a crane (d) a tap handle
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
5. 5.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
6. 6.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the fulcrum (d) the load
7. 7.True or false: yeast is needed for the ruler lever. (a) False (b) True
8. 8.🛟 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
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) coins of one kind (c) a flat table (d) a round pencil
10. 10.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
11. 11.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) harder (d) the same
12. 12.True or false: a crowbar uses a pulley. (a) False (b) True
13. 13.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
14. 14.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
15. 15.⚙️ Which simple machine is a sloping road? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
16. 16.⚖️ 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
17. 17.⚖️ 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
18. 18.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) the kind of coins (c) distance from the pencil (d) which side goes down
19. 19.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a battery cell (c) coins of one kind (d) a 30 cm ruler
21. 21.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) equal on both sides (d) always 10
22. 22.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a mirror (c) a round pencil (d) a 30 cm ruler
23. 23.🔮 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) both go up (d) the left side
24. 24.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
25. 25.⚖️ 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
26. 26.⚖️ 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 measure it (b) we change it (c) we keep it the same
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a mirror (d) a 30 cm ruler
28. 28.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they are too cold (d) they may swallow them
29. 29.🧺 Do we need turmeric powder 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? True or false: the kind of coins is the one thing we change. (a) False (b) True
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a flat table (d) a magnet
32. 32.True or false: a well pulley is a lever. (a) True (b) False
33. 33.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
34. 34.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
35. 35.⚖️ 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
36. 36.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) the kind of coins (c) which side goes down
37. 37.⚙️ Which of these is an inclined plane? (a) a crane (b) a slide (c) a see-saw (d) a steering wheel
38. 38.⚖️ 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 same ruler (b) the number of coins (c) which side goes down (d) distance from the pencil
39. 39.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
40. 40.True or false: a well pulley is an inclined plane. (a) True (b) False

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