Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 711 · 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 crowbar is a lever. (a) False (b) True
2. 2.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a spoon lifting a lid (c) a well pulley (d) a steering wheel
3. 3.⚖️ 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 same ruler (b) distance from the pencil (c) which side goes down (d) where the pencil is
4. 4.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 8 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.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) equal on both sides (d) always 10
7. 7.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) stand on the ruler (d) flick coins at faces
8. 8.🔮 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 left side (b) both go up (c) the right side (d) neither, it balances
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 12 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
10. 10.⚖️ 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
11. 11.⚙️ Which of these uses a pulley? (a) a well pulley (b) a see-saw (c) a slide (d) a tap handle
12. 12.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) distance from the pencil (c) where the pencil is (d) the kind of coins
13. 13.True or false: a flat table is needed for the ruler lever. (a) False (b) True
14. 14.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a flat table (c) a mirror (d) a battery cell
15. 15.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
16. 16.🧺 Which of these is not needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) a flat table (d) a round pencil
17. 17.True or false: a crane is a lever. (a) False (b) True
18. 18.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) coins of one kind (c) a mirror (d) yeast
19. 19.⚖️ 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
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
21. 21.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
22. 22.⚖️ 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
23. 23.🧺 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 flat table (d) yeast
24. 24.⚖️ 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?
25. 25.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
26. 26.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a round pencil (d) a flat table
27. 27.True or false: a doorknob is a wheel and axle. (a) True (b) False
28. 28.⚙️ Which of these is a lever? (a) a ramp (b) a slide (c) a crane (d) a spoon lifting a lid
29. 29.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
30. 30.True or false: a mirror is needed for the ruler lever. (a) False (b) True
31. 31.⚙️ Which simple machine is a flagpole? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
32. 32.⚖️ 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
33. 33.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are too cold (d) they are magnetic
34. 34.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) turmeric powder (d) a 30 cm ruler
35. 35.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
36. 36.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) False (b) True
37. 37.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
38. 38.⚖️ 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 keep it the same (b) we measure it (c) we change it
39. 39.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) easier (d) harder
40. 40.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever

Free science experiments lessons, practice and worksheets at talentjr.in/science-experiments-for-kids