Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 909 · 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 doorknob is a lever. (a) False (b) True
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) impossible (d) easier
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 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?
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a round pencil (c) a 30 cm ruler (d) a flat table
5. 5.⚙️ Which of these uses a pulley? (a) a flagpole (b) a doorknob (c) a spoon lifting a lid (d) a sloping road
6. 6.⚖️ 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) the same ruler (c) which side goes down
7. 7.🔮 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) both go up (d) the left side
8. 8.🧺 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
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a balloon (d) a 30 cm ruler
10. 10.True or false: yeast is not needed for the ruler lever. (a) False (b) True
11. 11.True or false: a sloping road is an inclined plane. (a) True (b) False
12. 12.True or false: a ramp is a wheel and axle. (a) False (b) True
13. 13.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) bend it till it snaps (d) stand on the ruler
14. 14.True or false: a crane uses a pulley. (a) True (b) False
15. 15.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a slide (c) a well pulley (d) a flagpole
16. 16.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a battery cell (d) a mirror
17. 17.True or false: a ramp uses a pulley. (a) False (b) True
18. 18.⚙️ Which of these is a lever? (a) a steering wheel (b) a well pulley (c) a crane (d) a crowbar
19. 19.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) turmeric powder (c) coins of one kind (d) a mirror
20. 20.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
21. 21.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) False (b) True
22. 22.⚖️ 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
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
25. 25.⚙️ Which simple machine is a ramp? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
27. 27.True or false: a see-saw uses a pulley. (a) False (b) True
28. 28.⚖️ 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
29. 29.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) coins of one kind (d) a round pencil
30. 30.True or false: a flat table is needed for the ruler lever. (a) True (b) False
31. 31.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) a lever boosts your push (c) the lid gets softer (d) the spoon is hot
32. 32.⚖️ 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?
33. 33.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a magnet (d) a round pencil
35. 35.⚙️ Which simple machine is a well pulley? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
36. 36.⚖️ 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?
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
38. 38.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a round pencil (c) a flat table (d) a 30 cm ruler
39. 39.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a flat table (d) a round pencil
40. 40.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a flat table (c) turmeric powder (d) a mirror

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