Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 382 · 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: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible
2. 2.🔮 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
3. 3.True or false: yeast is not needed for the ruler lever. (a) False (b) True
4. 4.⚖️ 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 keep it the same (b) we measure it (c) we change it
5. 5.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) equal on both sides (d) always 10
6. 6.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
7. 7.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
8. 8.🛟 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
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a round pencil (d) a 30 cm ruler
10. 10.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
11. 11.⚖️ 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) which side goes down (d) the kind of coins
12. 12.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
13. 13.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
14. 14.⚙️ Which simple machine is a tap handle? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
15. 15.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a balloon (c) a mirror (d) a round pencil
16. 16.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a round pencil (d) a magnet
17. 17.⚙️ Which of these uses a pulley? (a) a crowbar (b) a flagpole (c) a spoon lifting a lid (d) a tap handle
18. 18.⚙️ Which of these is a wheel and axle? (a) a well pulley (b) a doorknob (c) a sloping road (d) a see-saw
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) where the pencil is (c) which side goes down (d) the number of coins
20. 20.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) flick coins at faces (d) press it gently
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a balloon (c) a flat table (d) a round pencil
22. 22.True or false: a steering wheel is a lever. (a) True (b) False
23. 23.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
24. 24.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) a battery cell (d) a flat table
25. 25.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
26. 26.⚖️ 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?
27. 27.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a magnet (d) a flat table
28. 28.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
29. 29.⚖️ 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 measure it (b) we keep it the same (c) we change it
30. 30.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
31. 31.⚖️ 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
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a battery cell (d) a flat table
34. 34.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a sloping road (c) a bottle opener (d) a steering wheel
35. 35.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
36. 36.True or false: a well pulley uses a pulley. (a) False (b) True
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
38. 38.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
39. 39.⚖️ 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 measure it (b) we keep it the same (c) we change it
40. 40.True or false: a round pencil is needed for the ruler lever. (a) True (b) False

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