Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 546 · 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.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 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?
2. 2.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) equal on both sides (d) bigger on the left
3. 3.⚙️ Which simple machine is a sloping road? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
4. 4.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
5. 5.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
6. 6.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps
7. 7.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) turmeric powder (d) a battery cell
8. 8.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 3 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
9. 9.⚖️ 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) which side goes down (c) the same ruler (d) the kind of coins
10. 10.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a balloon (c) a battery cell (d) turmeric powder
11. 11.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) True (b) False
12. 12.🔮 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 left side (c) both go up (d) the right side
13. 13.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we change it (b) we keep it the same (c) we measure it
15. 15.⚖️ 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
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 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?
17. 17.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) False (b) True
18. 18.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
19. 19.⚙️ Which of these is a lever? (a) a sloping road (b) a flagpole (c) a bottle opener (d) a doorknob
20. 20.⚙️ Which of these is a wheel and axle? (a) a crowbar (b) a see-saw (c) a sloping road (d) a tap handle
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) the same ruler (c) which side goes down
22. 22.⚖️ 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 change it (b) we measure it (c) we keep it the same
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a battery cell (d) a flat table
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 1 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
27. 27.🧺 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 round pencil (d) a balloon
28. 28.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
29. 29.⚖️ 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 measure it (b) we keep it the same (c) we change it
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
31. 31.True or false: a steering wheel is a lever. (a) False (b) True
32. 32.⚙️ Which simple machine is a tap handle? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
33. 33.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
34. 34.⚙️ Which simple machine is a flagpole? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
35. 35.⚖️ 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) True (b) False
36. 36.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
37. 37.True or false: a slide is an inclined plane. (a) False (b) True
38. 38.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
39. 39.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit closer to middle (c) sit on the middle (d) sit farther from middle
40. 40.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed

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