Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 157 · 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 “which side goes down”? (a) we keep it the same (b) we change it (c) we measure it
2. 2.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we change it (b) we keep it the same (c) we measure it
3. 3.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a sloping road (c) a crane (d) a crowbar
4. 4.True or false: a spoon lifting a lid is an inclined plane. (a) False (b) True
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) coins of one kind (d) turmeric powder
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we change it (b) we measure it (c) we keep it the same
8. 8.True or false: yeast is needed for the ruler lever. (a) False (b) True
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 10 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
10. 10.True or false: a crane is a wheel and axle. (a) True (b) False
11. 11.True or false: a doorknob uses a pulley. (a) True (b) False
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
13. 13.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
14. 14.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) press it gently (d) stand on the ruler
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
16. 16.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
18. 18.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 12 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
20. 20.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
21. 21.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
22. 22.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
23. 23.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) always 10 (d) equal on both sides
24. 24.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
25. 25.⚙️ Which of these uses a pulley? (a) a sloping road (b) a bottle opener (c) a tap handle (d) a well pulley
26. 26.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a flat table (c) a magnet (d) a battery cell
27. 27.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
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) the kind of coins (b) the same ruler (c) distance from the pencil (d) where the pencil is
29. 29.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
30. 30.⚖️ 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
31. 31.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
32. 32.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
33. 33.True or false: a steering wheel is a lever. (a) True (b) False
34. 34.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
35. 35.⚖️ 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?
36. 36.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they are too cold (d) they may swallow them
37. 37.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) False (b) True
39. 39.True or false: a see-saw is a lever. (a) False (b) True
40. 40.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a slide (c) a flagpole (d) a tap handle

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