Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 944 · 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.⚙️ Which simple machine is a see-saw? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
2. 2.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a mirror
4. 4.⚖️ 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
5. 5.⚖️ 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) where the pencil is (c) distance from the pencil (d) the number of coins
6. 6.True or false: a balloon is needed for the ruler lever. (a) False (b) True
7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
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) the kind of coins (b) distance from the pencil (c) which side goes down
9. 9.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit on the middle (d) sit closer to middle
10. 10.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a mirror (c) coins of one kind (d) yeast
11. 11.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
12. 12.⚙️ Which of these is an inclined plane? (a) a slide (b) a tap handle (c) a flagpole (d) a bottle opener
13. 13.⚖️ 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
14. 14.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
15. 15.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the fulcrum (d) the axle
16. 16.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
18. 18.True or false: a steering wheel is a lever. (a) True (b) False
19. 19.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
20. 20.True or false: a see-saw uses a pulley. (a) True (b) False
21. 21.⚙️ Which simple machine is a sloping road? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
22. 22.⚙️ Which simple machine is a slide? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) yeast (d) a round pencil
24. 24.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
26. 26.🛟 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
27. 27.⚖️ 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?
28. 28.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) a lever boosts your push (d) the spoon is magnetic
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
30. 30.True or false: coins of one kind is needed for the ruler lever. (a) True (b) False
31. 31.⚖️ 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 kind of coins (b) where the pencil is (c) which side goes down (d) the number of coins
32. 32.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they may swallow them (d) they are magnetic
33. 33.⚖️ 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
34. 34.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
35. 35.True or false: a tap handle uses a pulley. (a) True (b) False
36. 36.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
37. 37.⚖️ 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
38. 38.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) always 10 (d) zero
39. 39.🔮 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
40. 40.True or false: a mirror is not needed for the ruler lever. (a) False (b) True

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