Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 392 · 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) a magnet (c) a 30 cm ruler (d) a flat table
2. 2.⚖️ 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 4 cm to the right to balance it?
3. 3.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a battery cell (c) a flat table (d) a mirror
4. 4.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a flat table (c) a 30 cm ruler (d) a round pencil
5. 5.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) press it gently (c) stand on the ruler (d) flick coins at faces
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a 30 cm ruler (c) a round pencil (d) a flat table
7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) False (b) True
8. 8.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are too cold (d) they are magnetic
9. 9.True or false: a crowbar is a wheel and axle. (a) True (b) False
10. 10.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) neither, it balances (c) the right side (d) the left side
11. 11.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 1 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
13. 13.⚖️ 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) the number of coins (c) distance from the pencil (d) the kind of coins
14. 14.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the spoon is hot (c) the spoon is magnetic (d) the lid gets softer
15. 15.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a magnet (d) a 30 cm ruler
16. 16.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
17. 17.⚖️ 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
18. 18.⚖️ 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
19. 19.⚙️ Which of these uses a pulley? (a) a crowbar (b) a tap handle (c) a well pulley (d) a bottle opener
20. 20.True or false: a steering wheel uses a pulley. (a) True (b) False
21. 21.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a well pulley (c) a slide (d) a steering wheel
22. 22.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) a mirror
24. 24.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) yeast
25. 25.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) sit farther from middle (d) jump up and down
26. 26.⚖️ 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 measure it (b) we change it (c) we keep it the same
27. 27.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) True (b) False
29. 29.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a balloon (c) coins of one kind (d) turmeric powder
30. 30.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
31. 31.⚙️ Which of these is an inclined plane? (a) a flagpole (b) a spoon lifting a lid (c) a see-saw (d) a ramp
32. 32.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
33. 33.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) yeast (c) a mirror (d) a battery cell
34. 34.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
35. 35.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
36. 36.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) equal on both sides (c) bigger on the left (d) zero
37. 37.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
39. 39.True or false: a well pulley is an inclined plane. (a) False (b) True
40. 40.True or false: a mirror is needed for the ruler lever. (a) False (b) True

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