Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 304 · 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.🧺 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 battery cell (d) a flat table
2. 2.⚙️ Which simple machine is a slide? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 8 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
4. 4.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) the left side (c) the right side (d) neither, it balances
5. 5.True or false: a flagpole uses a pulley. (a) False (b) True
6. 6.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a mirror (d) a round pencil
7. 7.True or false: a well pulley is a lever. (a) False (b) True
8. 8.🧺 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 mirror
9. 9.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a battery cell (c) yeast (d) a flat table
10. 10.True or false: a flagpole is an inclined plane. (a) False (b) True
11. 11.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “distance from the pencil”? (a) we keep it the same (b) we change it (c) we measure it
12. 12.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
13. 13.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
14. 14.⚖️ 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
15. 15.⚖️ 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 keep it the same (c) we measure it
16. 16.🛟 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
17. 17.⚖️ 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) True (b) False
18. 18.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
19. 19.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they may swallow them (d) they are magnetic
20. 20.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a magnet
21. 21.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
22. 22.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a mirror (c) a 30 cm ruler (d) a balloon
23. 23.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
24. 24.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
25. 25.True or false: a mirror is needed for the ruler lever. (a) True (b) False
26. 26.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
28. 28.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
29. 29.True or false: a sloping road is a wheel and axle. (a) False (b) True
30. 30.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is magnetic (c) a lever boosts your push (d) the spoon is hot
31. 31.⚖️ 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 measure it (b) we keep it the same (c) we change it
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 3 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
33. 33.⚖️ 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 same ruler (c) where the pencil is (d) which side goes down
34. 34.True or false: yeast is needed for the ruler lever. (a) True (b) False
35. 35.⚙️ Which of these is a wheel and axle? (a) a flagpole (b) a bottle opener (c) a slide (d) a tap handle
36. 36.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) False (b) True
37. 37.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
38. 38.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
39. 39.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) sit farther from middle (d) jump up and down
40. 40.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a sloping road (c) a flagpole (d) a crane

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