Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 300 · 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.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) bigger on the left (d) always 10
2. 2.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
3. 3.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a tap handle (c) a well pulley (d) a crane
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 right side (b) neither, it balances (c) both go up (d) the left side
5. 5.True or false: a flagpole is an inclined plane. (a) True (b) False
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) turmeric powder (c) a flat table (d) a 30 cm ruler
7. 7.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) coins of one kind (d) a mirror
9. 9.True or false: a crowbar is a wheel and axle. (a) False (b) True
10. 10.⚖️ 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 farther from middle (d) sit closer to middle
11. 11.⚖️ 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) where the pencil is (b) the same ruler (c) which side goes down (d) distance from the pencil
12. 12.⚖️ 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 keep it the same (b) we measure it (c) we change it
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 the one thing we change. (a) False (b) True
14. 14.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a magnet (c) a 30 cm ruler (d) yeast
15. 15.True or false: a bottle opener is an inclined plane. (a) True (b) False
16. 16.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
17. 17.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) harder (d) the same
18. 18.⚙️ Which simple machine is a sloping road? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
19. 19.⚖️ 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
20. 20.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
21. 21.⚙️ Which of these is a wheel and axle? (a) a steering wheel (b) a crane (c) a slide (d) a sloping road
22. 22.⚖️ 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) False (b) True
23. 23.True or false: a slide uses a pulley. (a) True (b) False
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a magnet (c) a 30 cm ruler (d) a flat table
25. 25.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the load (d) the fulcrum
26. 26.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
27. 27.True or false: a doorknob uses a pulley. (a) True (b) False
28. 28.⚖️ 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) True (b) False
29. 29.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) bend it till it snaps (c) flick coins at faces (d) stand on the ruler
30. 30.True or false: a tap handle uses a pulley. (a) False (b) True
31. 31.True or false: yeast is needed for the ruler lever. (a) True (b) False
32. 32.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
33. 33.⚙️ Which of these is a lever? (a) a well pulley (b) a tap handle (c) a bottle opener (d) a doorknob
34. 34.⚖️ 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?
35. 35.True or false: a see-saw is a lever. (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 number of coins”? (a) we change it (b) we keep it the same (c) we measure it
37. 37.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they are magnetic (d) they may swallow them
38. 38.🧺 Which of these is not needed for the ruler lever? (a) a magnet (b) a flat table (c) a 30 cm ruler (d) coins of one kind
39. 39.⚖️ 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) distance from the pencil (c) the kind of coins (d) where the pencil is
40. 40.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed

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