Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 86 · 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? What do we do with “the number of coins”? (a) we change it (b) we measure it (c) we keep it the same
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a battery cell
3. 3.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) True (b) False
5. 5.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) zero (c) bigger on the left (d) always 10
6. 6.⚖️ 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
7. 7.⚖️ What is the turning point of a lever called? (a) the axle (b) the load (c) the effort (d) the fulcrum
8. 8.True or false: a magnet is needed for the ruler lever. (a) True (b) False
9. 9.🧺 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 balloon (d) a flat table
10. 10.🔮 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
11. 11.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) bend it till it snaps (d) flick coins at faces
12. 12.True or false: a doorknob is a wheel and axle. (a) False (b) True
13. 13.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
14. 14.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) the same (d) impossible
15. 15.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a battery cell (c) a flat table (d) a magnet
16. 16.⚖️ 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) distance from the pencil (c) the same ruler (d) where the pencil is
17. 17.⚙️ Which of these is a wheel and axle? (a) a crane (b) a slide (c) a bottle opener (d) a doorknob
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
19. 19.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
20. 20.True or false: a tap handle is a wheel and axle. (a) False (b) True
21. 21.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a battery cell (c) a mirror (d) a 30 cm ruler
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) True (b) False
24. 24.⚖️ 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
25. 25.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a magnet
26. 26.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
27. 27.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
28. 28.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they are too cold (d) they may swallow them
29. 29.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
30. 30.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
31. 31.⚙️ Which of these is a lever? (a) a tap handle (b) a see-saw (c) a doorknob (d) a slide
32. 32.True or false: a flat table is needed for the ruler lever. (a) True (b) False
33. 33.⚙️ Which of these uses a pulley? (a) a bottle opener (b) a slide (c) a see-saw (d) a flagpole
34. 34.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) distance from the pencil (c) the kind of coins
35. 35.True or false: a sloping road is an inclined plane. (a) False (b) True
36. 36.True or false: a crane uses a pulley. (a) True (b) False
37. 37.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) jump up and down (d) sit closer to middle
38. 38.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a crane (c) a spoon lifting a lid (d) a sloping road
39. 39.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a 30 cm ruler (c) a flat table (d) a round pencil
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) True (b) False

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