Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 184 · 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.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) stand on the ruler (d) flick coins at faces
2. 2.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
3. 3.🔮 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) the left side (c) neither, it balances (d) both go up
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 10 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
5. 5.🛟 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
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) yeast (c) a round pencil (d) coins of one kind
7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) True (b) False
8. 8.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) coins of one kind (c) a round pencil (d) a flat table
9. 9.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
10. 10.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a 30 cm ruler (c) a flat table (d) a round pencil
12. 12.⚙️ Which of these is a wheel and axle? (a) a slide (b) a well pulley (c) a tap handle (d) a crowbar
13. 13.True or false: a crowbar is a lever. (a) False (b) True
14. 14.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a battery cell (c) a magnet (d) a mirror
15. 15.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
16. 16.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
18. 18.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the same ruler (b) distance from the pencil (c) which side goes down
19. 19.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
20. 20.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
21. 21.⚙️ Which of these is a wheel and axle? (a) a crane (b) a see-saw (c) a ramp (d) a steering wheel
22. 22.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) a lever boosts your push (d) the spoon is hot
23. 23.True or false: a sloping road is an inclined plane. (a) False (b) True
24. 24.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) turmeric powder
26. 26.⚖️ 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 change it (c) we measure it
27. 27.True or false: a see-saw uses a pulley. (a) False (b) True
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
29. 29.⚙️ Which of these is an inclined plane? (a) a ramp (b) a doorknob (c) a flagpole (d) a bottle opener
30. 30.⚖️ 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
31. 31.⚖️ 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) distance from the pencil (b) the same ruler (c) the kind of coins (d) the number of coins
32. 32.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
33. 33.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a flat table (d) a magnet
34. 34.True or false: turmeric powder is needed for the ruler lever. (a) False (b) True
35. 35.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
36. 36.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
38. 38.⚖️ 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
39. 39.⚖️ 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) the number of coins
40. 40.⚙️ Which simple machine is a crowbar? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle

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