Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 347 · 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.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a flat table (d) a 30 cm ruler
2. 2.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
3. 3.True or false: a crane is a wheel and axle. (a) False (b) True
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a magnet (c) coins of one kind (d) a flat table
5. 5.🛟 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
6. 6.⚖️ 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?
7. 7.⚙️ Which simple machine is a doorknob? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
8. 8.True or false: a crane uses a pulley. (a) False (b) True
9. 9.⚖️ 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 number of coins (b) distance from the pencil (c) which side goes down (d) the same ruler
10. 10.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a mirror (c) coins of one kind (d) a magnet
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 kept the same. (a) False (b) True
12. 12.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) True (b) False
13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a flat table (c) coins of one kind (d) a 30 cm ruler
14. 14.⚖️ 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
15. 15.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 8 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
17. 17.⚖️ 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) the kind of coins (c) the same ruler (d) which side goes down
18. 18.⚖️ 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 4 cm to the right to balance it?
19. 19.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) bigger on the left (d) equal on both sides
20. 20.True or false: a spoon lifting a lid is a wheel and axle. (a) False (b) True
21. 21.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) the spoon is hot (d) a lever boosts your push
22. 22.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a magnet (c) a battery cell (d) a flat table
23. 23.⚙️ Which simple machine is a ramp? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
24. 24.⚖️ 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
25. 25.True or false: a slide uses a pulley. (a) False (b) True
26. 26.⚙️ Which of these is a lever? (a) a tap handle (b) a ramp (c) a doorknob (d) a crowbar
27. 27.⚖️ 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
28. 28.🔮 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) the right side (c) both go up (d) neither, it balances
29. 29.⚖️ 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 number of coins (c) which side goes down
30. 30.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
31. 31.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
32. 32.True or false: a magnet is needed for the ruler lever. (a) True (b) False
33. 33.⚖️ 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
34. 34.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) impossible (d) harder
35. 35.🧺 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 battery cell (d) a 30 cm ruler
36. 36.True or false: a round pencil 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? What do we do with “the same ruler”? (a) we measure it (b) we keep it the same (c) we change it
38. 38.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
39. 39.True or false: a steering wheel is a wheel and axle. (a) False (b) True
40. 40.True or false: a battery cell is needed for the ruler lever. (a) False (b) True

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