Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 426 · 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) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
2. 2.⚖️ 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 keep it the same (c) we change it
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 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?
4. 4.⚖️ 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) distance from the pencil (d) which side goes down
5. 5.True or false: a ramp is an inclined plane. (a) True (b) False
6. 6.⚙️ Which simple machine is a tap handle? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
7. 7.True or false: yeast is not needed for the ruler lever. (a) True (b) False
8. 8.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
9. 9.🧺 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) yeast
10. 10.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
11. 11.True or false: a steering wheel uses a pulley. (a) True (b) False
12. 12.⚖️ 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) True (b) False
13. 13.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
14. 14.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) a flat table (d) a round pencil
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a flat table (c) coins of one kind (d) a round pencil
16. 16.True or false: yeast is needed for the ruler lever. (a) True (b) False
17. 17.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
18. 18.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a slide (c) a spoon lifting a lid (d) a tap handle
19. 19.⚖️ 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 number of coins (c) which side goes down (d) the kind of coins
20. 20.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 5 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
22. 22.🔮 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
23. 23.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they may swallow them (d) they are too shiny
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
25. 25.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
26. 26.⚙️ Which simple machine is a slide? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
27. 27.⚖️ 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 keep it the same (b) we measure it (c) we change it
28. 28.True or false: a steering wheel is a wheel and axle. (a) False (b) True
29. 29.⚖️ 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) False (b) True
30. 30.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) turmeric powder
31. 31.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
32. 32.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
33. 33.⚖️ 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 measure it (c) we keep it the same
34. 34.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
35. 35.True or false: a doorknob is a wheel and axle. (a) True (b) False
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a round pencil (c) a flat table (d) coins of one kind
37. 37.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
38. 38.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
39. 39.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
40. 40.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True

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