Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 395 · 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.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) harder (d) easier
2. 2.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are magnetic (c) they are too shiny (d) they are too cold
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) turmeric powder (d) a flat table
4. 4.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
5. 5.⚖️ 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 keep it the same (c) we measure it
6. 6.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) press it gently (d) stand on the ruler
7. 7.⚖️ 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 farther from middle (d) sit on the middle
8. 8.⚖️ 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) distance from the pencil (b) the number of coins (c) which side goes down (d) where the pencil is
9. 9.⚖️ 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?
10. 10.⚙️ Which of these is an inclined plane? (a) a crane (b) a bottle opener (c) a flagpole (d) a ramp
11. 11.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a balloon (d) a flat table
12. 12.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
13. 13.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
14. 14.⚙️ Which simple machine is a doorknob? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
15. 15.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a round pencil (c) a mirror (d) a magnet
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 5 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
17. 17.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
18. 18.True or false: a steering wheel is a wheel and axle. (a) False (b) True
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) True (b) False
20. 20.⚖️ 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
21. 21.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a flat table (c) yeast (d) a magnet
22. 22.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) a mirror (d) a round pencil
23. 23.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) turmeric powder (d) a 30 cm ruler
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
25. 25.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a battery cell (d) a 30 cm ruler
26. 26.True or false: a well pulley is a lever. (a) False (b) True
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
28. 28.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
29. 29.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
31. 31.⚖️ 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 measure it (c) we keep it the same
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.⚖️ 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 measure it (b) we keep it the same (c) we change it
34. 34.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
35. 35.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
36. 36.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 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?
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) False (b) True
39. 39.True or false: a doorknob is an inclined plane. (a) False (b) True
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a balloon (c) coins of one kind (d) a 30 cm ruler

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