Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 79 · 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) bigger on the left (b) always 10 (c) equal on both sides (d) zero
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 8 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
3. 3.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) the same (d) harder
4. 4.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
5. 5.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
6. 6.True or false: a crowbar is a lever. (a) False (b) True
7. 7.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
8. 8.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) yeast (c) a battery cell (d) a round pencil
9. 9.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
10. 10.⚖️ 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 change it (c) we measure it
11. 11.⚙️ Which of these uses a pulley? (a) a see-saw (b) a bottle opener (c) a crane (d) a doorknob
12. 12.🧺 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) turmeric powder
13. 13.⚖️ 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 change it (c) we measure it
14. 14.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) the spoon is magnetic (d) a lever boosts your push
15. 15.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) press it gently (d) flick coins at faces
16. 16.⚙️ Which of these is an inclined plane? (a) a slide (b) a crowbar (c) a flagpole (d) a tap handle
17. 17.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
18. 18.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
19. 19.True or false: yeast is needed for the ruler lever. (a) True (b) False
20. 20.🔮 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 left side (c) both go up (d) the right side
21. 21.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a magnet (c) a balloon (d) a battery cell
22. 22.⚙️ Which simple machine is a slide? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
23. 23.True or false: a magnet is needed for the ruler lever. (a) True (b) False
24. 24.⚙️ Which of these uses a pulley? (a) a bottle opener (b) a sloping road (c) a ramp (d) a flagpole
25. 25.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 10 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?
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
28. 28.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a magnet (d) a round pencil
30. 30.⚖️ 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?
31. 31.⚖️ 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
32. 32.True or false: yeast is not needed for the ruler lever. (a) False (b) True
33. 33.⚖️ 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) distance from the pencil (b) the number of coins (c) the same ruler (d) where the pencil is
34. 34.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a mirror (c) a battery cell (d) a 30 cm ruler
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a mirror (d) coins of one kind
36. 36.True or false: a balloon is needed for the ruler lever. (a) False (b) True
37. 37.⚙️ Which simple machine is a well pulley? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
38. 38.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a magnet (c) a flat table (d) turmeric powder
39. 39.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit on the middle (d) sit farther from middle
40. 40.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a round pencil (c) a 30 cm ruler (d) coins of one kind

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