Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 844 · 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.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 10 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?
3. 3.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
4. 4.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a round pencil (c) yeast (d) a battery cell
5. 5.True or false: a tap handle is an inclined plane. (a) True (b) False
6. 6.True or false: a flat table is needed for the ruler lever. (a) False (b) True
7. 7.⚖️ 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
8. 8.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a flat table (c) coins of one kind (d) a 30 cm ruler
12. 12.⚖️ 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) the same ruler
13. 13.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) True (b) False
15. 15.⚙️ Which simple machine is a steering wheel? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
17. 17.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) equal on both sides (d) bigger on the left
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
19. 19.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) stand on the ruler (d) press it gently
20. 20.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
21. 21.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
22. 22.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) turmeric powder (c) a flat table (d) a battery cell
23. 23.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a battery cell (d) a 30 cm ruler
24. 24.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) a balloon (d) turmeric powder
25. 25.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
26. 26.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a doorknob (c) a flagpole (d) a sloping road
27. 27.⚖️ 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
28. 28.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) sit closer to middle (d) jump up and down
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 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?
30. 30.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
31. 31.⚙️ Which simple machine is a tap handle? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
32. 32.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
33. 33.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
34. 34.🧺 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 balloon
35. 35.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
36. 36.🔮 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 left side (b) both go up (c) the right side (d) neither, it balances
37. 37.⚖️ 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
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) True (b) False
39. 39.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) yeast (d) a 30 cm ruler
40. 40.True or false: a bottle opener is a lever. (a) True (b) False

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