Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 694 · 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.🛟 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
2. 2.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
3. 3.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
4. 4.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a magnet (c) turmeric powder (d) coins of one kind
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 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?
6. 6.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a ramp (c) a see-saw (d) a crane
7. 7.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
8. 8.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
9. 9.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
10. 10.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a sloping road (c) a tap handle (d) a bottle opener
11. 11.⚙️ Which simple machine is a flagpole? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
12. 12.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
13. 13.🧺 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 balloon
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) turmeric powder (d) a round pencil
15. 15.🧺 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) a magnet
16. 16.True or false: a see-saw is a wheel and axle. (a) False (b) True
17. 17.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a magnet (c) a mirror (d) a flat table
18. 18.⚖️ 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 measure it (c) we change it
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) False (b) True
20. 20.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
21. 21.⚙️ Which simple machine is a well pulley? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
22. 22.⚙️ Which simple machine is a crane? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
23. 23.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit on the middle (d) sit closer to middle
24. 24.⚙️ Which simple machine is a see-saw? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
25. 25.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a magnet (c) a round pencil (d) a mirror
26. 26.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a 30 cm ruler (d) a flat table
27. 27.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) press it gently (d) bend it till it snaps
28. 28.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a sloping road (c) a doorknob (d) a see-saw
29. 29.⚖️ 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
30. 30.⚙️ Which of these is a lever? (a) a crane (b) a doorknob (c) a flagpole (d) a crowbar
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) False (b) True
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
33. 33.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) equal on both sides (d) bigger on the left
34. 34.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
35. 35.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
36. 36.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a battery cell (c) a flat table (d) a round pencil
37. 37.True or false: a see-saw is an inclined plane. (a) False (b) True
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) True (b) False
40. 40.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a crane (c) a flagpole (d) a doorknob

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