Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 55 · 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.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) neither, it balances (c) the left side (d) the right side
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 what we measure. (a) True (b) False
3. 3.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
5. 5.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a battery cell (c) a balloon (d) a round pencil
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 1 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
7. 7.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
8. 8.True or false: a crowbar is an inclined plane. (a) True (b) False
9. 9.True or false: yeast is not needed for the ruler lever. (a) False (b) True
10. 10.⚖️ 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
11. 11.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
12. 12.True or false: a crane uses a pulley. (a) False (b) True
13. 13.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) equal on both sides (d) bigger on the left
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
15. 15.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
16. 16.⚖️ 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 keep it the same (b) we change it (c) we measure it
17. 17.⚖️ 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
18. 18.⚖️ 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
19. 19.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
20. 20.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a mirror (c) a round pencil (d) a flat table
22. 22.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) False (b) True
23. 23.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) harder (d) easier
24. 24.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
25. 25.True or false: a mirror is needed for the ruler lever. (a) True (b) False
26. 26.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) a battery cell
27. 27.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
28. 28.⚖️ 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) which side goes down (c) distance from the pencil (d) the kind of coins
29. 29.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
30. 30.True or false: a tap handle is a lever. (a) True (b) False
31. 31.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a flagpole (c) a see-saw (d) a sloping road
32. 32.🧺 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 magnet
33. 33.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
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.⚖️ 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
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
37. 37.⚙️ Which simple machine is a tap handle? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
38. 38.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
39. 39.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
40. 40.⚖️ 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) False (b) True

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