Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 355 · 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) a flat table (b) a 30 cm ruler (c) a round pencil (d) a mirror
2. 2.⚙️ Which of these is a wheel and axle? (a) a well pulley (b) a doorknob (c) a flagpole (d) a crowbar
3. 3.⚖️ 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?
4. 4.True or false: a crowbar is a lever. (a) True (b) False
5. 5.⚖️ 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) the kind of coins
6. 6.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
7. 7.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) turmeric powder (c) a 30 cm ruler (d) yeast
8. 8.⚖️ 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) True (b) False
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a 30 cm ruler (c) a flat table (d) coins of one kind
10. 10.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
11. 11.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the right side (c) the left side (d) both go up
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 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?
13. 13.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
14. 14.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
15. 15.True or false: a mirror is needed for the ruler lever. (a) True (b) False
16. 16.⚙️ Which of these is a lever? (a) a ramp (b) a sloping road (c) a flagpole (d) a crowbar
17. 17.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they are too shiny (d) they may swallow them
18. 18.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
19. 19.⚖️ 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
20. 20.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
21. 21.⚖️ 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) the same ruler (b) distance from the pencil (c) the number of coins (d) where the pencil is
22. 22.⚙️ Which of these uses a pulley? (a) a sloping road (b) a crane (c) a tap handle (d) a crowbar
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) turmeric powder (c) coins of one kind (d) a flat table
24. 24.⚙️ Which of these is a lever? (a) a bottle opener (b) a doorknob (c) a well pulley (d) a slide
25. 25.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the load (d) the axle
26. 26.⚖️ 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 change it (c) we measure it
27. 27.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
28. 28.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) easier (d) the same
29. 29.⚙️ Which of these uses a pulley? (a) a crowbar (b) a slide (c) a see-saw (d) a flagpole
30. 30.⚙️ Which of these is an inclined plane? (a) a slide (b) a see-saw (c) a steering wheel (d) a tap handle
31. 31.⚙️ Which of these is a wheel and axle? (a) a flagpole (b) a tap handle (c) a see-saw (d) a sloping road
32. 32.True or false: a steering wheel is a wheel and axle. (a) True (b) False
33. 33.True or false: a balloon is needed for the ruler lever. (a) True (b) False
34. 34.⚖️ 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
35. 35.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) a lever boosts your push (c) the spoon is magnetic (d) the lid gets softer
36. 36.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
37. 37.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
38. 38.⚖️ 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) which side goes down (c) where the pencil is
39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) True (b) False
40. 40.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed

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