Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 638 · 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.⚖️ 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) a lever boosts your push (d) the lid gets softer
2. 2.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) turmeric powder
3. 3.🛟 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
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a round pencil (d) turmeric powder
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) False (b) True
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 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?
7. 7.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
8. 8.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
9. 9.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
10. 10.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
11. 11.⚙️ Which simple machine is a steering wheel? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
12. 12.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a 30 cm ruler (c) a flat table (d) a round pencil
14. 14.True or false: yeast is needed for the ruler lever. (a) False (b) True
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
16. 16.⚖️ 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) where the pencil is (c) the same ruler (d) the number of coins
17. 17.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a battery cell (c) yeast (d) a mirror
18. 18.⚙️ Which of these is a lever? (a) a ramp (b) a steering wheel (c) a bottle opener (d) a well pulley
19. 19.True or false: a sloping road is a wheel and axle. (a) True (b) False
20. 20.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a battery cell (c) a 30 cm ruler (d) a balloon
21. 21.⚖️ 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 measure it (b) we keep it the same (c) we change it
22. 22.⚖️ 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) False (b) True
23. 23.True or false: a mirror is needed for the ruler lever. (a) True (b) False
24. 24.⚙️ Which simple machine is a flagpole? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
25. 25.🧺 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 mirror (d) a flat table
26. 26.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) the same (d) harder
27. 27.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) equal on both sides (c) zero (d) bigger on the left
28. 28.⚖️ 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 keep it the same (b) we change it (c) we measure it
29. 29.⚖️ 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) False (b) True
30. 30.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
31. 31.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
32. 32.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
33. 33.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps
34. 34.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
35. 35.True or false: a bottle opener is a lever. (a) True (b) False
36. 36.⚖️ 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
37. 37.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) a magnet

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