Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 811 · 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 not needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) a round pencil (d) a flat table
2. 2.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
3. 3.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) the spoon is magnetic (d) a lever boosts your push
4. 4.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
5. 5.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a slide (c) a steering wheel (d) a well pulley
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) which side goes down (b) distance from the pencil (c) the same ruler
7. 7.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
8. 8.⚙️ Which simple machine is a doorknob? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a 30 cm ruler (d) a mirror
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
11. 11.⚙️ Which of these is a lever? (a) a flagpole (b) a crane (c) a crowbar (d) a steering wheel
12. 12.True or false: a see-saw is an inclined plane. (a) False (b) True
13. 13.⚖️ 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) False (b) True
14. 14.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) always 10 (d) equal on both sides
15. 15.⚙️ Which simple machine is a crane? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
16. 16.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
17. 17.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a magnet (c) coins of one kind (d) a flat table
19. 19.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
20. 20.⚙️ Which of these uses a pulley? (a) a sloping road (b) a crane (c) a slide (d) a see-saw
21. 21.⚙️ Which of these is a lever? (a) a see-saw (b) a doorknob (c) a sloping road (d) a steering wheel
22. 22.⚖️ 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
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the number of coins (b) distance from the pencil (c) which side goes down (d) the same ruler
24. 24.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
25. 25.⚖️ 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 keep it the same (b) we change it (c) we measure it
26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) yeast (c) a round pencil (d) coins of one kind
27. 27.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) easier (d) harder
28. 28.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
29. 29.🔮 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) the right side (d) both go up
30. 30.⚖️ 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 measure it (c) we change it
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a flat table (c) coins of one kind (d) a round pencil
32. 32.True or false: a bottle opener is a lever. (a) False (b) True
33. 33.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
34. 34.🧺 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) turmeric powder
35. 35.True or false: a balloon is needed for the ruler lever. (a) False (b) True
36. 36.⚖️ 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?
37. 37.⚖️ 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 number of coins (c) which side goes down
38. 38.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) a battery cell
39. 39.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a sloping road (c) a steering wheel (d) a well pulley
40. 40.True or false: a flat table is needed for the ruler lever. (a) False (b) True

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