Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 907 · 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 should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are too shiny (d) they are magnetic
2. 2.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) always 10 (c) equal on both sides (d) zero
3. 3.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a round pencil (c) a 30 cm ruler (d) coins of one kind
4. 4.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
5. 5.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a ramp (c) a slide (d) a well pulley
6. 6.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) coins of one kind (c) a flat table (d) a 30 cm ruler
8. 8.True or false: a tap handle uses a pulley. (a) True (b) False
9. 9.⚖️ 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 change it (c) we keep it the same
10. 10.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
11. 11.⚖️ 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
12. 12.⚙️ Which simple machine is a crowbar? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
13. 13.⚖️ 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
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
15. 15.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) bend it till it snaps (d) press it gently
16. 16.⚙️ Which simple machine is a tap handle? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
17. 17.True or false: a crowbar is an inclined plane. (a) True (b) False
18. 18.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
20. 20.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
21. 21.True or false: a crowbar is a lever. (a) True (b) False
22. 22.⚖️ 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) the same ruler (c) where the pencil is (d) which side goes down
23. 23.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a doorknob (c) a spoon lifting a lid (d) a bottle opener
24. 24.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
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 balloon (d) a flat table
26. 26.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
27. 27.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
28. 28.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a magnet (c) a flat table (d) yeast
29. 29.True or false: a tap handle is a wheel and axle. (a) False (b) True
30. 30.🔮 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) both go up (d) the left side
31. 31.🧺 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
32. 32.⚖️ 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 number of coins (b) the same ruler (c) distance from the pencil (d) where the pencil is
33. 33.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a slide (c) a ramp (d) a steering wheel
34. 34.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
35. 35.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a tap handle (c) a spoon lifting a lid (d) a flagpole
36. 36.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a magnet (c) a flat table (d) a round pencil
37. 37.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a battery cell (d) a round pencil
38. 38.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a balloon (d) a round pencil
39. 39.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a steering wheel (c) a ramp (d) a flagpole
40. 40.True or false: a sloping road is an inclined plane. (a) False (b) True

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