Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 690 · 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? True or false: which side goes down is what we measure. (a) True (b) False
2. 2.⚖️ 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 keep it the same (b) we change it (c) we measure it
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 1 cm to the right to balance it?
4. 4.⚙️ Which of these is a lever? (a) a flagpole (b) a sloping road (c) a bottle opener (d) a crane
5. 5.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a magnet (c) a 30 cm ruler (d) coins of one kind
6. 6.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
7. 7.⚖️ 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 number of coins (c) distance from the pencil
8. 8.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they may swallow them (d) they are magnetic
9. 9.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
10. 10.⚖️ 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) distance from the pencil (c) which side goes down (d) the kind of coins
11. 11.True or false: a bottle opener uses a pulley. (a) True (b) False
12. 12.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
13. 13.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) a flat table (d) a balloon
14. 14.True or false: a spoon lifting a lid is a lever. (a) True (b) False
15. 15.⚙️ Which of these is a lever? (a) a crane (b) a flagpole (c) a doorknob (d) a crowbar
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
17. 17.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) equal on both sides (d) zero
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a battery cell (d) a 30 cm ruler
19. 19.⚙️ Which simple machine is a ramp? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
20. 20.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a mirror (c) a round pencil (d) a balloon
21. 21.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) harder (d) easier
22. 22.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
23. 23.⚖️ 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 measure it (b) we keep it the same (c) we change it
24. 24.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
25. 25.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a tap handle (c) a slide (d) a see-saw
26. 26.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
28. 28.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) sit farther from middle (d) jump up and down
29. 29.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) press it gently (d) flick coins at faces
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 change it (b) we keep it the same (c) we measure it
31. 31.⚖️ 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) True (b) False
32. 32.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
33. 33.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
34. 34.🔮 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) both go up (d) the left side
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) False (b) True
36. 36.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) a 30 cm ruler (d) a magnet
37. 37.⚙️ Which simple machine is a slide? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
38. 38.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a round pencil (c) a flat table (d) coins of one kind
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) the same ruler (c) which side goes down
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 6 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?

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