Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 539 · 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 shiny (b) they are too cold (c) they may swallow them (d) they are magnetic
2. 2.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
3. 3.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) turmeric powder (c) coins of one kind (d) a round pencil
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) the kind of coins (c) the same ruler (d) where the pencil is
5. 5.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a 30 cm ruler (c) a battery cell (d) turmeric powder
6. 6.True or false: a flat table is not 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 kind of coins is what we measure. (a) True (b) False
8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a magnet (d) a 30 cm ruler
9. 9.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a battery cell (d) a 30 cm ruler
10. 10.⚙️ Which simple machine is a tap handle? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
11. 11.True or false: a crane uses a pulley. (a) False (b) True
12. 12.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a see-saw (c) a ramp (d) a crowbar
13. 13.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a mirror (c) a 30 cm ruler (d) a flat table
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
15. 15.🧺 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) turmeric powder
16. 16.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a slide (c) a well pulley (d) a tap handle
17. 17.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 10 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
19. 19.True or false: a ramp is an inclined plane. (a) True (b) False
20. 20.True or false: a mirror is needed for the ruler lever. (a) True (b) False
21. 21.⚖️ What is the turning point of a lever called? (a) the axle (b) the load (c) the effort (d) the fulcrum
22. 22.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
23. 23.⚙️ Which simple machine is a sloping road? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
24. 24.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
25. 25.True or false: a slide is an inclined plane. (a) False (b) True
26. 26.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
27. 27.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) yeast (d) a 30 cm ruler
29. 29.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) where the pencil is (b) distance from the pencil (c) which side goes down
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a magnet (d) coins of one kind
32. 32.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) always 10 (c) bigger on the left (d) zero
33. 33.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit closer to middle (c) sit on the middle (d) sit farther from middle
34. 34.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) the same (d) easier
35. 35.⚖️ 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?
36. 36.True or false: a ramp is a wheel and axle. (a) True (b) False
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a balloon
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 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?
39. 39.🛟 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
40. 40.True or false: a crowbar uses a pulley. (a) False (b) True

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