Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 358 · 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.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they may swallow them (d) they are too shiny
2. 2.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) distance from the pencil (c) where the pencil is (d) the kind of coins
3. 3.⚖️ 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) 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 30 cm ruler (c) coins of one kind (d) a balloon
5. 5.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
6. 6.⚖️ 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 measure it (c) we keep it the same
7. 7.⚖️ 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) where the pencil is (b) distance from the pencil (c) which side goes down (d) the kind of coins
8. 8.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
9. 9.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) bend it till it snaps (d) press it gently
10. 10.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) coins of one kind (c) a flat table (d) a 30 cm ruler
11. 11.⚙️ Which simple machine is a doorknob? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
12. 12.True or false: a sloping road is a wheel and axle. (a) True (b) False
13. 13.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a balloon (c) coins of one kind (d) a mirror
14. 14.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) zero (d) always 10
15. 15.⚖️ 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 2 cm to the right to balance it?
16. 16.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
17. 17.🔮 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) the left side (d) both go up
18. 18.True or false: a steering wheel is a wheel and axle. (a) True (b) False
19. 19.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is the one thing we change. (a) True (b) False
20. 20.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit farther from middle (d) sit on the middle
21. 21.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a magnet (d) coins of one kind
22. 22.True or false: a flagpole is a wheel and axle. (a) True (b) False
23. 23.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) a lever boosts your push (c) the lid gets softer (d) the spoon is magnetic
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
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) turmeric powder (d) a 30 cm ruler
26. 26.⚖️ 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) False (b) True
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) coins of one kind (c) a flat table (d) a 30 cm ruler
28. 28.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a 30 cm ruler (c) a magnet (d) a balloon
29. 29.⚖️ 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
30. 30.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) distance from the pencil (c) the kind of coins
32. 32.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a 30 cm ruler (d) turmeric powder
33. 33.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a steering wheel (c) a see-saw (d) a ramp
34. 34.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a doorknob (c) a crane (d) a slide
35. 35.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a balloon (c) a flat table (d) turmeric powder
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
37. 37.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
39. 39.⚖️ 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
40. 40.⚖️ 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

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