Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 406 · 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.⚖️ 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
2. 2.🧺 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) coins of one kind
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
4. 4.⚙️ Which of these is a wheel and axle? (a) a crane (b) a slide (c) a steering wheel (d) a see-saw
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
6. 6.True or false: a crowbar is a wheel and axle. (a) True (b) False
7. 7.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a mirror (d) a round pencil
8. 8.⚖️ 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) distance from the pencil (c) where the pencil is
9. 9.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) zero (d) equal on both sides
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 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?
11. 11.⚖️ 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) the same ruler (c) which side goes down (d) where the pencil is
12. 12.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a mirror (c) coins of one kind (d) a balloon
13. 13.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
14. 14.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) harder (d) the same
15. 15.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the load (d) the fulcrum
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
17. 17.⚙️ Which simple machine is a flagpole? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
18. 18.⚖️ 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
19. 19.True or false: a slide uses a pulley. (a) True (b) False
20. 20.🧺 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 balloon
21. 21.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
22. 22.⚖️ 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?
23. 23.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a balloon (d) a magnet
24. 24.🔮 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) both go up (c) neither, it balances (d) the left side
25. 25.⚙️ Which simple machine is a ramp? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
26. 26.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) turmeric powder (c) a round pencil (d) a 30 cm ruler
28. 28.True or false: a tap handle is a wheel and axle. (a) True (b) False
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
30. 30.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) sit closer to middle (d) jump up and down
31. 31.🛟 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
32. 32.True or false: a see-saw is a wheel and axle. (a) True (b) False
33. 33.⚖️ 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 number of coins (c) which side goes down (d) the kind of coins
34. 34.⚙️ Which of these uses a pulley? (a) a slide (b) a well pulley (c) a spoon lifting a lid (d) a sloping road
35. 35.True or false: yeast is needed for the ruler lever. (a) False (b) True
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 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?
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) yeast (d) a 30 cm ruler
38. 38.True or false: a see-saw is a lever. (a) False (b) True
39. 39.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
40. 40.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a tap handle (c) a crowbar (d) a spoon lifting a lid

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