Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 118 · 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 flat table (c) a round pencil (d) a battery cell
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a 30 cm ruler (d) a mirror
4. 4.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
5. 5.🧺 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
6. 6.⚖️ 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 change it (b) we keep it the same (c) we measure it
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
8. 8.⚙️ Which of these uses a pulley? (a) a crane (b) a bottle opener (c) a crowbar (d) a tap handle
9. 9.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
10. 10.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
11. 11.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a balloon (d) a round pencil
13. 13.⚙️ Which of these is a lever? (a) a steering wheel (b) a spoon lifting a lid (c) a doorknob (d) a flagpole
14. 14.⚖️ 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
15. 15.🔮 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
16. 16.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit farther from middle (c) jump up and down (d) sit on the middle
17. 17.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) press it gently (d) stand on the ruler
18. 18.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) True (b) False
19. 19.⚖️ 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 keep it the same (b) we measure it (c) we change it
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
21. 21.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
22. 22.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
23. 23.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
24. 24.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a crane (c) a sloping road (d) a spoon lifting a lid
25. 25.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
26. 26.⚙️ Which simple machine is a tap handle? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
27. 27.True or false: a slide is a wheel and axle. (a) True (b) False
28. 28.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
29. 29.⚖️ 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) False (b) True
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
31. 31.⚙️ Which of these is a wheel and axle? (a) a slide (b) a doorknob (c) a bottle opener (d) a well pulley
32. 32.⚖️ 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 spoon is magnetic (d) the lid gets softer
33. 33.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
34. 34.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) always 10 (d) zero
35. 35.⚖️ 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
36. 36.⚖️ 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
37. 37.True or false: a flagpole is a wheel and axle. (a) False (b) True
38. 38.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) a magnet
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
40. 40.True or false: yeast is needed for the ruler lever. (a) True (b) False

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