Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 840 · 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: a round pencil is needed for the ruler lever. (a) True (b) False
2. 2.⚖️ 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
3. 3.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) zero (d) always 10
4. 4.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) the same ruler (c) distance from the pencil
6. 6.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a magnet (c) a round pencil (d) a balloon
7. 7.⚙️ Which of these uses a pulley? (a) a crowbar (b) a see-saw (c) a sloping road (d) a crane
8. 8.⚖️ 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
9. 9.⚖️ 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
10. 10.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) yeast (d) a 30 cm ruler
11. 11.⚖️ 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) where the pencil is (b) the kind of coins (c) distance from the pencil (d) the number of coins
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
13. 13.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
14. 14.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
15. 15.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) bend it till it snaps (d) stand on the ruler
16. 16.⚙️ Which simple machine is a ramp? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
17. 17.True or false: a magnet is needed for the ruler lever. (a) False (b) True
18. 18.True or false: a slide is a wheel and axle. (a) False (b) True
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
20. 20.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
21. 21.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too cold (d) they are too shiny
22. 22.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) impossible (d) the same
23. 23.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
24. 24.⚖️ 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
25. 25.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
26. 26.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) a balloon (d) turmeric powder
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) True (b) False
28. 28.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
29. 29.⚙️ Which of these is an inclined plane? (a) a slide (b) a spoon lifting a lid (c) a see-saw (d) a flagpole
30. 30.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
31. 31.⚖️ 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 kind of coins (d) distance from the pencil
32. 32.True or false: a flagpole uses a pulley. (a) False (b) True
33. 33.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) a flat table (c) a round pencil (d) a 30 cm ruler
34. 34.⚖️ 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
35. 35.True or false: yeast is needed for the ruler lever. (a) True (b) False
36. 36.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a magnet (d) a flat table
37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) True (b) False
38. 38.True or false: a doorknob is a wheel and axle. (a) False (b) True
39. 39.🔮 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 right side (b) both go up (c) the left side (d) neither, it balances
40. 40.True or false: a tap handle uses a pulley. (a) True (b) False

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