Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 611 · 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.⚖️ 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
2. 2.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 8 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
6. 6.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the right side (c) the left side (d) both go up
7. 7.True or false: a see-saw is a lever. (a) False (b) True
8. 8.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) flick coins at faces (d) bend it till it snaps
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) yeast (c) a flat table (d) coins of one kind
10. 10.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the spoon is hot (c) the lid gets softer (d) a lever boosts your push
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 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?
12. 12.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
13. 13.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
14. 14.⚖️ 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 measure it (b) we keep it the same (c) we change it
15. 15.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a magnet (c) a mirror (d) a battery cell
16. 16.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
17. 17.True or false: a slide is an inclined plane. (a) False (b) True
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a mirror (c) a 30 cm ruler (d) a flat table
19. 19.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
20. 20.⚖️ 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 keep it the same (c) we change it
21. 21.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
22. 22.⚙️ Which of these is an inclined plane? (a) a ramp (b) a well pulley (c) a bottle opener (d) a steering wheel
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) a magnet
24. 24.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) always 10 (c) zero (d) equal on both sides
25. 25.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a mirror (d) a 30 cm ruler
26. 26.True or false: a doorknob is a wheel and axle. (a) True (b) False
27. 27.True or false: a bottle opener is a lever. (a) True (b) False
28. 28.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
29. 29.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) turmeric powder (c) a mirror (d) a battery cell
30. 30.⚙️ Which of these is a wheel and axle? (a) a flagpole (b) a crane (c) a sloping road (d) a doorknob
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) where the pencil is (b) distance from the pencil (c) the number of coins (d) which side goes down
32. 32.⚙️ Which of these is a lever? (a) a ramp (b) a crane (c) a well pulley (d) a bottle opener
33. 33.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
34. 34.True or false: a flat table is needed for the ruler lever. (a) False (b) True
35. 35.⚖️ 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) distance from the pencil (b) the number of coins (c) the kind of coins (d) which side goes down
36. 36.True or false: a crowbar is a lever. (a) False (b) True
37. 37.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the kind of coins (b) distance from the pencil (c) which side goes down
39. 39.True or false: yeast is needed for the ruler lever. (a) True (b) False
40. 40.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too shiny (d) they are too cold

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