Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 210 · 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.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a balloon (c) a battery cell (d) a flat table
2. 2.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) True (b) False
3. 3.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
4. 4.⚙️ Which simple machine is a ramp? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
5. 5.⚖️ 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?
6. 6.⚖️ 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 number of coins (b) which side goes down (c) the same ruler (d) distance from the pencil
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 3 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
8. 8.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a magnet (c) a balloon (d) turmeric powder
9. 9.⚖️ 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?
10. 10.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a ramp (c) a tap handle (d) a sloping road
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 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?
12. 12.⚖️ 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
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) the number of coins (c) the kind of coins (d) which side goes down
14. 14.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) yeast (d) a battery cell
15. 15.⚙️ Which simple machine is a slide? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
16. 16.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) the same ruler (c) distance from the pencil
17. 17.⚖️ 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
18. 18.True or false: a crowbar is a lever. (a) True (b) False
19. 19.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
20. 20.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) stand on the ruler (d) press it gently
21. 21.⚖️ 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) where the pencil is (c) which side goes down
22. 22.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a flagpole (c) a doorknob (d) a see-saw
23. 23.⚖️ 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
24. 24.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) True (b) False
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 10 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.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a 30 cm ruler (c) a flat table (d) a round pencil
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a 30 cm ruler (d) a battery cell
28. 28.⚙️ Which simple machine is a flagpole? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
29. 29.True or false: yeast is not needed for the ruler lever. (a) True (b) False
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
31. 31.⚖️ 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) False (b) True
32. 32.🔮 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
33. 33.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
34. 34.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a steering wheel (c) a bottle opener (d) a flagpole
35. 35.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
36. 36.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a mirror (d) a 30 cm ruler
37. 37.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
39. 39.⚙️ Which simple machine is a see-saw? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
40. 40.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a mirror (c) a 30 cm ruler (d) a round pencil

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