Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 161 · 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.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) always 10 (d) bigger on the left
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) a balloon
3. 3.🔮 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) the left side (c) neither, it balances (d) both go up
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) where the pencil is (b) the same ruler (c) the number of coins (d) which side goes down
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
6. 6.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
7. 7.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
8. 8.⚖️ 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 keep it the same (c) we change it
9. 9.⚖️ 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 farther from middle (d) sit on the middle
10. 10.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the axle (d) the effort
11. 11.⚙️ Which simple machine is a well pulley? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
12. 12.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
13. 13.⚙️ Which simple machine is a steering wheel? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
14. 14.⚖️ 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
15. 15.True or false: a balloon is needed for the ruler lever. (a) False (b) True
16. 16.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
17. 17.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) flick coins at faces (d) bend it till it snaps
18. 18.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a balloon (c) yeast (d) a mirror
19. 19.⚙️ Which simple machine is a sloping road? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
20. 20.⚙️ Which simple machine is a crane? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
21. 21.⚖️ 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 measure it (c) we keep it the same
22. 22.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
23. 23.⚙️ Which simple machine is a flagpole? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
24. 24.⚙️ Which of these is an inclined plane? (a) a ramp (b) a doorknob (c) a steering wheel (d) a crowbar
25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a magnet (c) a flat table (d) a round pencil
26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a mirror (c) a flat table (d) a round pencil
27. 27.True or false: a bottle opener uses a pulley. (a) True (b) False
28. 28.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a magnet (c) a 30 cm ruler (d) a battery cell
29. 29.True or false: a ramp is an inclined plane. (a) False (b) True
30. 30.⚖️ 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 measure it (c) we change it
31. 31.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) easier (d) the same
32. 32.True or false: a bottle opener is an inclined plane. (a) True (b) False
33. 33.True or false: a tap handle is a wheel and axle. (a) False (b) True
34. 34.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a round pencil (c) coins of one kind (d) a flat table
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) yeast
36. 36.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
37. 37.True or false: a mirror is needed for the ruler lever. (a) False (b) True
38. 38.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
39. 39.⚙️ Which of these uses a pulley? (a) a doorknob (b) a sloping road (c) a tap handle (d) a well pulley
40. 40.⚖️ 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

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