Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 494 · 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.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
2. 2.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) the left side (c) neither, it balances (d) the right side
3. 3.⚖️ 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
4. 4.⚙️ Which of these uses a pulley? (a) a slide (b) a tap handle (c) a see-saw (d) a flagpole
5. 5.True or false: yeast is not needed for the ruler lever. (a) True (b) False
6. 6.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
7. 7.⚖️ 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 measure it (c) we keep it the same
8. 8.⚖️ 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 change it (c) we measure it
9. 9.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
10. 10.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they are too shiny (d) they may swallow them
11. 11.True or false: a see-saw is a wheel and axle. (a) True (b) False
12. 12.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) harder (d) the same
13. 13.⚖️ 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) which side goes down (b) distance from the pencil (c) the kind of coins (d) the number of coins
14. 14.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a flat table (c) turmeric powder (d) a magnet
15. 15.⚙️ Which of these is a wheel and axle? (a) a slide (b) a sloping road (c) a ramp (d) a doorknob
16. 16.⚖️ 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
17. 17.⚙️ Which of these uses a pulley? (a) a well pulley (b) a bottle opener (c) a ramp (d) a crowbar
18. 18.⚖️ 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 keep it the same (b) we change it (c) we measure it
19. 19.True or false: a steering wheel is a wheel and axle. (a) False (b) True
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a battery cell (c) a 30 cm ruler (d) coins of one kind
21. 21.🧺 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 flat table
22. 22.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
23. 23.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
25. 25.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
26. 26.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a crane (c) a well pulley (d) a tap handle
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the number of coins (b) distance from the pencil (c) where the pencil is (d) which side goes down
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
29. 29.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
30. 30.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a balloon (d) a round pencil
31. 31.True or false: yeast is needed for the ruler lever. (a) True (b) False
32. 32.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) turmeric powder (d) a flat table
34. 34.True or false: a steering wheel is a lever. (a) False (b) True
35. 35.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) coins of one kind (d) a mirror
36. 36.⚖️ 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
37. 37.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
38. 38.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
40. 40.⚖️ 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

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