Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 878 · 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 of these is not needed for the ruler lever? (a) a battery cell (b) a round pencil (c) a 30 cm ruler (d) a flat table
2. 2.⚙️ Which of these is a lever? (a) a well pulley (b) a sloping road (c) a crane (d) a bottle opener
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
4. 4.⚖️ 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 change it (b) we keep it the same (c) we measure it
5. 5.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too shiny (c) they are too cold (d) they are magnetic
6. 6.⚙️ Which of these uses a pulley? (a) a crane (b) a slide (c) a doorknob (d) a see-saw
7. 7.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the lid gets softer (c) the spoon is magnetic (d) the spoon is hot
8. 8.⚙️ Which of these is a wheel and axle? (a) a sloping road (b) a tap handle (c) a well pulley (d) a crowbar
9. 9.True or false: a sloping road is an inclined plane. (a) True (b) False
10. 10.⚖️ 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 same ruler (c) the number of coins (d) which side goes down
11. 11.⚙️ Which simple machine is a flagpole? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
12. 12.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) bigger on the left (d) always 10
13. 13.True or false: a mirror is needed for the ruler lever. (a) False (b) True
14. 14.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 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?
16. 16.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
17. 17.⚖️ 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
18. 18.⚙️ Which simple machine is a steering wheel? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
19. 19.⚙️ Which of these is a lever? (a) a ramp (b) a well pulley (c) a spoon lifting a lid (d) a flagpole
20. 20.⚖️ 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 number of coins (b) which side goes down (c) the same ruler (d) the kind of coins
21. 21.⚙️ Which of these uses a pulley? (a) a ramp (b) a flagpole (c) a bottle opener (d) a crowbar
22. 22.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a battery cell (c) a flat table (d) a round pencil
23. 23.🧺 Which of these is needed for the ruler lever? (a) yeast (b) turmeric powder (c) a mirror (d) a round pencil
24. 24.⚖️ 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 change it (b) we keep it the same (c) we measure it
25. 25.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a ramp (c) a crane (d) a doorknob
26. 26.⚖️ 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) which side goes down (c) distance from the pencil
27. 27.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) easier (d) impossible
28. 28.🧺 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 flat table (d) turmeric powder
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) the left side (b) both go up (c) the right side (d) neither, it balances
30. 30.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
31. 31.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
32. 32.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
33. 33.True or false: a round pencil is needed for the ruler lever. (a) True (b) False
34. 34.⚖️ 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
35. 35.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) yeast (c) a round pencil (d) a flat table
36. 36.⚖️ 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
37. 37.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
38. 38.⚙️ Which of these is a lever? (a) a well pulley (b) a steering wheel (c) a flagpole (d) a crowbar
39. 39.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
40. 40.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a 30 cm ruler (d) yeast

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