Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 227 · 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.True or false: a magnet is needed for the ruler lever. (a) False (b) True
2. 2.⚖️ 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?
3. 3.True or false: a crane is a lever. (a) True (b) False
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) True (b) False
5. 5.⚖️ 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
6. 6.⚙️ Which of these uses a pulley? (a) a doorknob (b) a ramp (c) a flagpole (d) a slide
7. 7.🛟 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
8. 8.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the left side (b) the right side (c) neither, it balances (d) both go up
9. 9.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
10. 10.True or false: a crowbar is a lever. (a) True (b) False
11. 11.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) bend it till it snaps (c) flick coins at faces (d) stand on the ruler
12. 12.⚖️ 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 same ruler (b) which side goes down (c) distance from the pencil
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 change it (b) we measure it (c) we keep it the same
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) a battery cell
15. 15.⚙️ Which simple machine is a slide? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
16. 16.⚖️ 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
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
18. 18.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
19. 19.True or false: a balloon is needed for the ruler lever. (a) False (b) True
20. 20.⚖️ 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
21. 21.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a battery cell (c) a 30 cm ruler (d) a mirror
22. 22.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) turmeric powder
23. 23.⚖️ 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
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
25. 25.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the spoon is magnetic (c) a lever boosts your push (d) the lid gets softer
26. 26.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a bottle opener (c) a crowbar (d) a ramp
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
28. 28.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
29. 29.True or false: a tap handle uses a pulley. (a) False (b) True
30. 30.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a 30 cm ruler (c) a flat table (d) coins of one kind
31. 31.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
33. 33.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
34. 34.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a round pencil (c) yeast (d) a magnet
35. 35.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
36. 36.⚙️ Which of these is a lever? (a) a ramp (b) a doorknob (c) a crowbar (d) a flagpole
37. 37.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a flat table (d) coins of one kind
38. 38.⚙️ Which simple machine is a doorknob? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
39. 39.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
40. 40.⚖️ 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) the kind of coins (c) distance from the pencil

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