Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 111 · 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 well pulley? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
2. 2.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
3. 3.⚖️ 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
4. 4.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a round pencil (c) a 30 cm ruler (d) a flat table
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
7. 7.⚖️ 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 measure it (b) we change it (c) we keep it the same
8. 8.⚖️ 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
9. 9.⚙️ Which simple machine is a slide? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
11. 11.⚖️ 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?
12. 12.⚖️ 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 change it (b) we keep it the same (c) we measure it
13. 13.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
14. 14.⚙️ Which of these is a lever? (a) a see-saw (b) a sloping road (c) a doorknob (d) a well pulley
15. 15.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
16. 16.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they may swallow them (d) they are too cold
17. 17.True or false: a sloping road is a lever. (a) True (b) False
18. 18.⚖️ 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) where the pencil is (c) the kind of coins (d) distance from the pencil
19. 19.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a mirror (c) yeast (d) coins of one kind
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a mirror (c) a flat table (d) a round pencil
21. 21.⚖️ 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) which side goes down (c) the number of coins
22. 22.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
23. 23.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a doorknob (c) a sloping road (d) a ramp
24. 24.⚖️ 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
25. 25.⚖️ 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 number of coins (c) where the pencil is (d) which side goes down
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 8 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
27. 27.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
28. 28.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) harder (d) the same
29. 29.True or false: a sloping road uses a pulley. (a) True (b) False
30. 30.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
31. 31.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a balloon (c) yeast (d) a round pencil
32. 32.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
33. 33.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
34. 34.🔮 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 left side (b) neither, it balances (c) the right side (d) both go up
35. 35.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a magnet (d) a flat table
36. 36.True or false: a tap handle is a wheel and axle. (a) True (b) False
37. 37.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
38. 38.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
39. 39.True or false: a steering wheel is a wheel and axle. (a) True (b) False
40. 40.True or false: a magnet is needed for the ruler lever. (a) True (b) False

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