Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 949 · 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.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) turmeric powder (c) a magnet (d) a mirror
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
3. 3.⚖️ 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
4. 4.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are magnetic (d) they are too shiny
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) which side goes down (b) where the pencil is (c) distance from the pencil (d) the same ruler
6. 6.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a bottle opener (c) a spoon lifting a lid (d) a ramp
7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) harder (d) the same
8. 8.⚖️ 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 kind of coins (b) the same ruler (c) which side goes down (d) distance from the pencil
9. 9.True or false: a sloping road is an inclined plane. (a) True (b) False
10. 10.True or false: a balloon is needed for the ruler lever. (a) True (b) False
11. 11.⚙️ Which of these is an inclined plane? (a) a sloping road (b) a flagpole (c) a crane (d) a see-saw
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 3 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
13. 13.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the effort (d) the axle
14. 14.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a balloon (d) a 30 cm ruler
15. 15.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) flick coins at faces (d) press it gently
16. 16.⚖️ 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 measure it (b) we change it (c) we keep it the same
17. 17.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a round pencil (c) a mirror (d) a balloon
18. 18.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) a magnet
19. 19.True or false: a bottle opener is an inclined plane. (a) False (b) True
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a mirror (c) coins of one kind (d) a round pencil
21. 21.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
22. 22.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) a lever boosts your push (d) the spoon is hot
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
24. 24.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
25. 25.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a magnet
28. 28.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
29. 29.⚖️ 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 change it (b) we measure it (c) we keep it the same
30. 30.True or false: a crowbar is a lever. (a) True (b) False
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a round pencil (d) a mirror
32. 32.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
33. 33.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) turmeric powder (d) coins of one kind
34. 34.⚖️ 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
35. 35.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
36. 36.True or false: a spoon lifting a lid is a lever. (a) False (b) True
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a flat table (c) a 30 cm ruler (d) a round pencil
38. 38.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
39. 39.True or false: a bottle opener is a lever. (a) False (b) True
40. 40.⚙️ Which of these uses a pulley? (a) a crane (b) a see-saw (c) a bottle opener (d) a slide

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