Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 410 · 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.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
3. 3.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the kind of coins”? (a) we measure it (b) we change it (c) we keep it the same
4. 4.🛟 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
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) a mirror
6. 6.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) bend it till it snaps (c) stand on the ruler (d) flick coins at faces
7. 7.⚖️ 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
8. 8.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
9. 9.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
10. 10.🔮 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) both go up (c) neither, it balances (d) the right side
11. 11.⚙️ Which of these is a lever? (a) a slide (b) a crowbar (c) a tap handle (d) a ramp
12. 12.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) False (b) True
14. 14.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
15. 15.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
16. 16.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) where the pencil is (c) the same ruler (d) distance from the pencil
17. 17.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
18. 18.⚖️ 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
19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a 30 cm ruler (c) a round pencil (d) coins of one kind
20. 20.True or false: a see-saw is a wheel and axle. (a) True (b) False
21. 21.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
22. 22.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a mirror (c) a battery cell (d) a balloon
23. 23.⚖️ 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
24. 24.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a see-saw (c) a bottle opener (d) a ramp
25. 25.⚙️ Which simple machine is a crane? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a 30 cm ruler (c) a round pencil (d) coins of one kind
27. 27.⚙️ Which of these uses a pulley? (a) a crane (b) a bottle opener (c) a spoon lifting a lid (d) a tap handle
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) distance from the pencil (b) the number of coins (c) which side goes down
29. 29.True or false: a slide is an inclined plane. (a) False (b) True
30. 30.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) a mirror (d) turmeric powder
31. 31.⚙️ Which of these is a lever? (a) a well pulley (b) a flagpole (c) a doorknob (d) a bottle opener
32. 32.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a magnet (d) a round pencil
33. 33.⚖️ 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 change it (c) we keep it the same
34. 34.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the fulcrum (d) the effort
35. 35.True or false: a doorknob is a wheel and axle. (a) False (b) True
36. 36.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) equal on both sides (d) bigger on the left
37. 37.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
38. 38.⚖️ 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
39. 39.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) coins of one kind (d) a round pencil
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) a battery cell

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