Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 823 · 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.🔮 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) neither, it balances (c) the right side (d) both go up
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 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?
3. 3.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
4. 4.⚙️ Which of these uses a pulley? (a) a flagpole (b) a spoon lifting a lid (c) a crowbar (d) a sloping road
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a magnet (c) a 30 cm ruler (d) a flat table
6. 6.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) bigger on the left (c) always 10 (d) zero
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a flat table (d) a balloon
8. 8.⚖️ 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) the lid gets softer (d) a lever boosts your push
9. 9.⚖️ 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
10. 10.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
11. 11.⚖️ 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 measure it (b) we change it (c) we keep it the same
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
13. 13.⚖️ 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 measure it (b) we change it (c) we keep it the same
14. 14.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a bottle opener (c) a see-saw (d) a tap handle
15. 15.⚙️ Which of these is a lever? (a) a sloping road (b) a bottle opener (c) a slide (d) a steering wheel
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 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?
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 3 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
18. 18.⚙️ Which of these is a lever? (a) a slide (b) a well pulley (c) a crane (d) a spoon lifting a lid
19. 19.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a magnet (c) yeast (d) a 30 cm ruler
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) False (b) True
21. 21.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) yeast
22. 22.True or false: a crowbar is a lever. (a) True (b) False
23. 23.True or false: a flagpole uses a pulley. (a) True (b) False
24. 24.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) harder (d) easier
25. 25.⚖️ 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) True (b) False
26. 26.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a mirror (c) a balloon (d) coins of one kind
27. 27.⚖️ 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) the number of coins (c) which side goes down (d) the same ruler
28. 28.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
29. 29.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they are too shiny (d) they may swallow them
30. 30.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
31. 31.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) press it gently (d) stand on the ruler
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
33. 33.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
34. 34.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a sloping road (c) a spoon lifting a lid (d) a flagpole
35. 35.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) a magnet (d) a flat table
36. 36.True or false: a crowbar uses a pulley. (a) True (b) False
37. 37.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) True (b) False
38. 38.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a bottle opener (c) a tap handle (d) a well pulley
39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) False (b) True
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a round pencil (d) yeast

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