Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 501 · 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) turmeric powder (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
2. 2.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too shiny (d) they are too cold
3. 3.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) False (b) True
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a 30 cm ruler (d) a battery cell
6. 6.True or false: a crowbar is a lever. (a) True (b) False
7. 7.🔮 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
8. 8.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 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?
10. 10.True or false: a flagpole is an inclined plane. (a) True (b) False
11. 11.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
12. 12.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
13. 13.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) harder (d) the same
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 3 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
15. 15.⚖️ 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) distance from the pencil (c) the kind of coins (d) the same ruler
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 5 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
17. 17.⚖️ 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
18. 18.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) equal on both sides (c) zero (d) bigger on the left
19. 19.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a balloon (d) a mirror
20. 20.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
21. 21.True or false: a balloon is needed for the ruler lever. (a) False (b) True
22. 22.⚖️ 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 measure it (b) we keep it the same (c) we change it
23. 23.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a flat table (c) a battery cell (d) a mirror
24. 24.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) flick coins at faces (d) press it gently
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
26. 26.⚙️ Which simple machine is a slide? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
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 same ruler (b) distance from the pencil (c) which side goes down (d) the kind of coins
28. 28.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) yeast (c) a 30 cm ruler (d) a round pencil
29. 29.True or false: a ramp is a wheel and axle. (a) True (b) False
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
31. 31.⚙️ Which simple machine is a steering wheel? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
32. 32.⚙️ Which simple machine is a crane? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
34. 34.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
35. 35.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 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?
36. 36.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a flagpole (c) a steering wheel (d) a slide
37. 37.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
38. 38.True or false: a flagpole uses a pulley. (a) True (b) False
39. 39.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) yeast (c) a round pencil (d) a magnet
40. 40.⚙️ Which of these is a lever? (a) a steering wheel (b) a well pulley (c) a crane (d) a bottle opener

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