Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 497 · 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.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 5 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
2. 2.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) yeast (c) a round pencil (d) a balloon
3. 3.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
4. 4.⚙️ Which simple machine is a tap handle? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) which side goes down (c) where the pencil is (d) the number of coins
6. 6.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
7. 7.True or false: a well pulley is a wheel and axle. (a) True (b) False
8. 8.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) a flat table (d) coins of one kind
9. 9.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
10. 10.True or false: a spoon lifting a lid is a wheel and axle. (a) False (b) True
11. 11.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
12. 12.True or false: a doorknob is a lever. (a) True (b) False
13. 13.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a 30 cm ruler (c) coins of one kind (d) a flat table
15. 15.⚖️ 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 number of coins (b) distance from the pencil (c) which side goes down
16. 16.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) neither, it balances (c) the right side (d) the left side
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) turmeric powder (c) a flat table (d) coins of one kind
18. 18.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) equal on both sides (d) zero
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) False (b) True
20. 20.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) sit closer to middle (d) jump up and down
21. 21.True or false: a bottle opener is an inclined plane. (a) True (b) False
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
23. 23.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
24. 24.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) a mirror (d) coins of one kind
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
26. 26.⚖️ 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) False (b) True
27. 27.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the spoon is hot (c) a lever boosts your push (d) the lid gets softer
28. 28.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
29. 29.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
30. 30.⚙️ Which simple machine is a crowbar? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
31. 31.⚙️ Which simple machine is a sloping road? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
32. 32.⚖️ 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) where the pencil is (b) the number of coins (c) distance from the pencil (d) the kind of coins
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
34. 34.True or false: a spoon lifting a lid uses a pulley. (a) False (b) True
35. 35.⚖️ 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 keep it the same (c) we change it
36. 36.⚖️ 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 measure it (c) we keep it the same
37. 37.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
38. 38.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) coins of one kind (c) turmeric powder (d) a battery cell
39. 39.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
40. 40.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they may swallow them (d) they are too cold

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