Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 288 · 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 an inclined plane? (a) a flagpole (b) a crowbar (c) a sloping road (d) a spoon lifting a lid
2. 2.True or false: a flat table is needed for the ruler lever. (a) True (b) False
3. 3.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
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) the left side (b) neither, it balances (c) both go up (d) the right side
5. 5.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) True (b) False
7. 7.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit on the middle (c) sit closer to middle (d) sit farther from middle
8. 8.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a round pencil (c) a battery cell (d) a mirror
9. 9.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a doorknob (c) a ramp (d) a see-saw
10. 10.⚖️ 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 keep it the same (b) we measure it (c) we change it
11. 11.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) distance from the pencil (c) which side goes down (d) the same ruler
12. 12.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a magnet (d) a round pencil
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) False (b) True
14. 14.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the spoon is hot (c) the lid gets softer (d) the spoon is magnetic
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
16. 16.True or false: a doorknob is a wheel and axle. (a) False (b) True
17. 17.True or false: yeast is needed for the ruler lever. (a) True (b) False
18. 18.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
19. 19.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
20. 20.⚖️ 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
21. 21.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the kind of coins (b) which side goes down (c) distance from the pencil
22. 22.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
23. 23.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
24. 24.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) bigger on the left (c) zero (d) always 10
25. 25.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they are too cold (d) they may swallow them
26. 26.True or false: a slide is an inclined plane. (a) False (b) True
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a balloon
28. 28.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
29. 29.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) flick coins at faces (d) stand on the ruler
30. 30.⚖️ 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) distance from the pencil (b) the number of coins (c) the same ruler (d) where the pencil is
31. 31.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
32. 32.⚖️ What is the turning point of a lever called? (a) the load (b) the fulcrum (c) the effort (d) the axle
33. 33.⚖️ 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 change it (b) we measure it (c) we keep it the same
34. 34.⚖️ 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
35. 35.⚙️ Which simple machine is a well pulley? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
36. 36.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) turmeric powder (c) a 30 cm ruler (d) a balloon
37. 37.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
38. 38.True or false: yeast is not needed for the ruler lever. (a) False (b) True
39. 39.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) coins of one kind (d) yeast
40. 40.⚙️ Which simple machine is a sloping road? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley

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