Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 731 · 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? True or false: the same ruler is kept the same. (a) False (b) True
2. 2.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
3. 3.⚖️ 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?
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) False (b) True
6. 6.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a balloon (c) a battery cell (d) yeast
7. 7.⚙️ Which of these uses a pulley? (a) a crowbar (b) a crane (c) a see-saw (d) a sloping road
8. 8.True or false: a bottle opener 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 “the same ruler”? (a) we keep it the same (b) we change it (c) we measure it
10. 10.⚖️ 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) True (b) False
11. 11.⚙️ Which of these is an inclined plane? (a) a crane (b) a ramp (c) a see-saw (d) a flagpole
12. 12.True or false: a flat table is needed for the ruler lever. (a) True (b) False
13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a 30 cm ruler (c) a round pencil (d) coins of one kind
14. 14.🔮 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 right side (b) both go up (c) neither, it balances (d) the left side
15. 15.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
17. 17.True or false: a doorknob uses a pulley. (a) True (b) False
18. 18.⚖️ 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) distance from the pencil (c) the number of coins (d) the kind of coins
19. 19.True or false: a slide is an inclined plane. (a) False (b) True
20. 20.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) harder (d) easier
21. 21.🧺 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 round pencil (d) yeast
22. 22.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the kind of coins (b) distance from the pencil (c) which side goes down
23. 23.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a spoon lifting a lid (c) a crowbar (d) a sloping road
24. 24.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
25. 25.⚙️ Which of these is a lever? (a) a doorknob (b) a flagpole (c) a crowbar (d) a tap handle
26. 26.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) turmeric powder (c) a round pencil (d) a balloon
27. 27.⚖️ 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
28. 28.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
29. 29.⚙️ Which simple machine is a doorknob? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
30. 30.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a sloping road (c) a steering wheel (d) a ramp
31. 31.⚖️ 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 measure it (c) we change it
32. 32.⚙️ Which of these uses a pulley? (a) a flagpole (b) a steering wheel (c) a see-saw (d) a spoon lifting a lid
33. 33.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
34. 34.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a battery cell (d) a flat table
36. 36.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
37. 37.True or false: yeast is needed for the ruler lever. (a) True (b) False
38. 38.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) yeast (d) coins of one kind
39. 39.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a mirror (c) coins of one kind (d) a flat table
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False

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