Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 243 · 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) yeast (b) a 30 cm ruler (c) a round pencil (d) a flat table
2. 2.⚖️ 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) a lever boosts your push (d) the spoon is magnetic
3. 3.⚙️ Which of these uses a pulley? (a) a slide (b) a crowbar (c) a crane (d) a steering wheel
4. 4.⚙️ Which of these is a wheel and axle? (a) a flagpole (b) a doorknob (c) a see-saw (d) a crowbar
5. 5.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
6. 6.⚖️ 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 keep it the same (c) we measure it
7. 7.True or false: a crane is a lever. (a) False (b) True
8. 8.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) stand on the ruler (d) flick coins at faces
9. 9.⚙️ Which of these uses a pulley? (a) a crowbar (b) a flagpole (c) a bottle opener (d) a doorknob
10. 10.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
11. 11.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
12. 12.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit farther from middle (c) sit closer to middle (d) sit on the middle
13. 13.⚖️ 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
14. 14.🔮 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) the right side (c) neither, it balances (d) both go up
15. 15.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
16. 16.⚙️ Which simple machine is a sloping road? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
17. 17.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they may swallow them (d) they are too shiny
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance 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 the one thing we change. (a) True (b) False
20. 20.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) zero (d) always 10
21. 21.True or false: a bottle opener is a lever. (a) False (b) True
22. 22.⚙️ Which of these is a lever? (a) a steering wheel (b) a slide (c) a crane (d) a bottle opener
23. 23.⚖️ 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) True (b) False
24. 24.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
25. 25.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a tap handle (c) a bottle opener (d) a sloping road
26. 26.⚖️ 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
27. 27.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
28. 28.⚙️ Which of these uses a pulley? (a) a well pulley (b) a spoon lifting a lid (c) a steering wheel (d) a slide
29. 29.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
30. 30.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a mirror (c) a battery cell (d) a 30 cm ruler
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 1 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
33. 33.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a balloon (c) a magnet (d) a mirror
34. 34.⚙️ Which of these is an inclined plane? (a) a ramp (b) a tap handle (c) a see-saw (d) a crane
35. 35.True or false: a crowbar uses a pulley. (a) False (b) True
36. 36.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
37. 37.⚙️ Which simple machine is a doorknob? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
38. 38.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
39. 39.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
40. 40.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True

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