Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 579 · 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 doorknob? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
2. 2.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
3. 3.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
4. 4.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) turmeric powder (d) a round pencil
5. 5.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) a balloon
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.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a crowbar (c) a flagpole (d) a doorknob
8. 8.True or false: a ramp is an inclined plane. (a) True (b) False
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) where the pencil is (b) distance from the pencil (c) which side goes down
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
11. 11.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a crane (c) a doorknob (d) a ramp
12. 12.True or false: a crane uses a pulley. (a) False (b) True
13. 13.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
14. 14.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) coins of one kind (c) a flat table (d) a round pencil
15. 15.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
16. 16.⚙️ Which simple machine is a well pulley? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) a balloon
18. 18.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
19. 19.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a round pencil (d) a magnet
21. 21.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
22. 22.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a sloping road (c) a crane (d) a tap handle
23. 23.⚖️ 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 number of coins (b) which side goes down (c) the same ruler (d) distance from the pencil
24. 24.⚖️ 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 change it (c) we keep it the same
25. 25.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a mirror (c) a flat table (d) yeast
26. 26.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) stand on the ruler (d) press it gently
27. 27.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
28. 28.⚖️ 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
29. 29.🔮 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
30. 30.⚙️ Which of these uses a pulley? (a) a doorknob (b) a steering wheel (c) a crane (d) a see-saw
31. 31.True or false: a flagpole uses a pulley. (a) True (b) False
32. 32.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) True (b) False
33. 33.True or false: a flagpole is a lever. (a) True (b) False
34. 34.⚖️ 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
35. 35.⚖️ 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?
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a round pencil (c) a 30 cm ruler (d) a flat table
37. 37.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too shiny (d) they are too cold
38. 38.True or false: a crane is a lever. (a) False (b) True
39. 39.True or false: a well pulley is a wheel and axle. (a) True (b) False
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 10 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?

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