Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 754 · 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.⚙️ Which simple machine is a doorknob? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
2. 2.⚖️ 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) the number of coins
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) neither, it balances (b) the right side (c) the left side (d) both go up
4. 4.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a flat table (c) a 30 cm ruler (d) coins of one kind
6. 6.⚖️ 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 keep it the same (b) we measure it (c) we change it
7. 7.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) press it gently (d) stand on the ruler
8. 8.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too cold (d) they are too shiny
9. 9.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
10. 10.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) turmeric powder (c) a flat table (d) a round pencil
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 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?
12. 12.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
13. 13.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a balloon (d) a round pencil
14. 14.True or false: a tap handle is a wheel and axle. (a) True (b) False
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
16. 16.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) False (b) True
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) turmeric powder (d) a 30 cm ruler
18. 18.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
19. 19.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
20. 20.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) equal on both sides (c) zero (d) bigger on the left
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
22. 22.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
23. 23.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a 30 cm ruler (c) a magnet (d) a battery cell
24. 24.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) yeast
26. 26.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a see-saw (c) a bottle opener (d) a crane
27. 27.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
28. 28.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a mirror (c) a flat table (d) coins of one kind
29. 29.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
30. 30.⚖️ 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
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we change it (b) we measure it (c) we keep it the same
32. 32.True or false: a flat table is needed for the ruler lever. (a) False (b) True
33. 33.⚙️ Which of these is a wheel and axle? (a) a well pulley (b) a tap handle (c) a spoon lifting a lid (d) a sloping road
34. 34.⚖️ 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 change it (b) we keep it the same (c) we measure it
35. 35.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
36. 36.⚙️ Which of these uses a pulley? (a) a slide (b) a ramp (c) a doorknob (d) a flagpole
37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) False (b) True
38. 38.⚖️ 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
39. 39.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
40. 40.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a flat table (c) a battery cell (d) yeast

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