Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 258 · 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.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
2. 2.⚖️ 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 2 cm to the right to balance it?
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
4. 4.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a mirror (c) coins of one kind (d) a round pencil
5. 5.⚙️ Which of these uses a pulley? (a) a tap handle (b) a doorknob (c) a well pulley (d) a steering wheel
6. 6.⚖️ 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) where the pencil is (c) distance from the pencil
7. 7.True or false: a flagpole is a lever. (a) False (b) True
8. 8.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a battery cell (c) a round pencil (d) turmeric powder
9. 9.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they are magnetic (d) they may swallow them
10. 10.⚖️ 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
11. 11.🧺 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 flat table (d) turmeric powder
12. 12.⚖️ 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
13. 13.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
14. 14.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a sloping road (c) a flagpole (d) a crane
15. 15.⚖️ 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 keep it the same (b) we measure it (c) we change it
16. 16.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a battery cell (c) a 30 cm ruler (d) a flat table
17. 17.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) easier (d) harder
18. 18.⚖️ 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
19. 19.⚙️ Which of these uses a pulley? (a) a bottle opener (b) a tap handle (c) a flagpole (d) a spoon lifting a lid
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.True or false: a spoon lifting a lid is an inclined plane. (a) True (b) False
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 keep it the same (b) we measure it (c) we change it
23. 23.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a balloon (d) a round pencil
25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) yeast (d) coins of one kind
26. 26.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
27. 27.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a magnet (c) coins of one kind (d) turmeric powder
28. 28.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
29. 29.🔮 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
30. 30.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
31. 31.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) a lever boosts your push (c) the spoon is hot (d) the lid gets softer
32. 32.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
33. 33.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a balloon (d) a 30 cm ruler
34. 34.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
35. 35.⚖️ 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
36. 36.True or false: a mirror is needed for the ruler lever. (a) True (b) False
37. 37.True or false: a spoon lifting a lid uses a pulley. (a) False (b) True
38. 38.⚖️ 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) where the pencil is (c) the kind of coins (d) which side goes down
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
40. 40.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True

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