Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 281 · 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 same ruler”? (a) we measure it (b) we change it (c) we keep it the same
2. 2.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) which side goes down (c) the same ruler
3. 3.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) press it gently (d) bend it till it snaps
4. 4.⚖️ 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 same ruler (b) the kind of coins (c) distance from the pencil (d) the number of coins
5. 5.⚖️ 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 change it (b) we keep it the same (c) we measure it
6. 6.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit farther from middle (c) sit on the middle (d) jump up and down
7. 7.True or false: a well pulley uses a pulley. (a) False (b) True
8. 8.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a battery cell (c) a magnet (d) yeast
9. 9.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
10. 10.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
11. 11.⚖️ 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
12. 12.⚙️ Which simple machine is a tap handle? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
13. 13.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a 30 cm ruler (c) coins of one kind (d) a round pencil
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
17. 17.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
18. 18.🧺 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) a balloon
19. 19.⚙️ Which of these is a wheel and axle? (a) a slide (b) a well pulley (c) a steering wheel (d) a spoon lifting a lid
20. 20.⚖️ 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) which side goes down (c) distance from the pencil
21. 21.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
22. 22.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) yeast (d) a 30 cm ruler
23. 23.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) impossible (d) easier
24. 24.True or false: a slide is an inclined plane. (a) False (b) True
25. 25.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a balloon (c) yeast (d) a mirror
26. 26.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) coins of one kind (c) a 30 cm ruler (d) a flat table
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) True (b) False
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
29. 29.🧺 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 battery cell
30. 30.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
31. 31.True or false: a magnet is needed for the ruler lever. (a) True (b) False
32. 32.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) zero (c) always 10 (d) bigger on the left
33. 33.True or false: a crowbar is a lever. (a) False (b) True
34. 34.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
35. 35.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a flat table (c) a 30 cm ruler (d) coins of one kind
36. 36.⚙️ Which simple machine is a slide? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
37. 37.⚙️ Which of these is a lever? (a) a see-saw (b) a doorknob (c) a well pulley (d) a steering wheel
38. 38.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) turmeric powder (d) a 30 cm ruler
39. 39.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a mirror (c) a flat table (d) a 30 cm ruler
40. 40.⚖️ 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) False (b) True

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