Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 198 · 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.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
2. 2.🛟 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
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 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?
4. 4.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a mirror (c) a balloon (d) coins of one kind
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 3 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil and 3 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? Which of these is what we measure? (a) the number of coins (b) which side goes down (c) where the pencil is (d) the kind of coins
8. 8.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
9. 9.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) flick coins at faces (d) bend it till it snaps
10. 10.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a 30 cm ruler (d) a balloon
12. 12.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
13. 13.⚙️ Which simple machine is a bottle opener? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
14. 14.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
15. 15.⚙️ Which simple machine is a tap handle? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
16. 16.True or false: a crane is a lever. (a) False (b) True
17. 17.⚖️ 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 keep it the same (b) we measure it (c) we change it
18. 18.⚖️ What is the turning point of a lever called? (a) the axle (b) the load (c) the fulcrum (d) the effort
19. 19.⚖️ 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
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
21. 21.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) yeast
22. 22.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) yeast (c) a 30 cm ruler (d) a flat table
24. 24.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
25. 25.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
26. 26.True or false: a sloping road is an inclined plane. (a) True (b) False
27. 27.⚖️ 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 change it (b) we keep it the same (c) we measure it
28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) turmeric powder (c) coins of one kind (d) a round pencil
29. 29.⚖️ 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) False (b) True
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) True (b) False
31. 31.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a ramp (c) a crowbar (d) a slide
32. 32.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a ramp (c) a crane (d) a crowbar
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 keep it the same (b) we measure it (c) we change it
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
35. 35.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
36. 36.True or false: a flagpole is a wheel and axle. (a) False (b) True
37. 37.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
38. 38.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a round pencil (d) a flat table
39. 39.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) yeast (c) a magnet (d) a 30 cm ruler
40. 40.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) impossible (d) the same

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