Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 71 · 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: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the right side (b) both go up (c) neither, it balances (d) the left side
2. 2.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
3. 3.True or false: a crowbar is a lever. (a) False (b) True
4. 4.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a steering wheel (c) a ramp (d) a slide
5. 5.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
6. 6.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
7. 7.True or false: a sloping road uses a pulley. (a) True (b) False
8. 8.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
9. 9.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
10. 10.🛟 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
11. 11.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
12. 12.True or false: yeast is not needed for the ruler lever. (a) False (b) True
13. 13.🧺 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 round pencil (d) a flat table
14. 14.🧺 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 balloon (d) a flat table
15. 15.⚖️ 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 same ruler (b) the kind of coins (c) where the pencil is (d) which side goes down
16. 16.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) turmeric powder (c) a battery cell (d) a balloon
17. 17.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
18. 18.⚖️ 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 kind of coins (c) the number of coins (d) where the pencil is
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
20. 20.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
21. 21.⚖️ 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
22. 22.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is the one thing we change. (a) False (b) True
23. 23.⚙️ Which of these uses a pulley? (a) a bottle opener (b) a sloping road (c) a see-saw (d) a flagpole
24. 24.⚖️ 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) False (b) True
25. 25.⚖️ 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 number of coins (b) distance from the pencil (c) which side goes down
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 5 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a mirror (c) coins of one kind (d) a 30 cm ruler
28. 28.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) a balloon
29. 29.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
30. 30.⚖️ 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?
31. 31.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they are magnetic (d) they may swallow them
32. 32.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a magnet (c) a flat table (d) a round pencil
33. 33.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
34. 34.True or false: a sloping road is an inclined plane. (a) True (b) False
35. 35.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) a lever boosts your push (c) the spoon is hot (d) the spoon is magnetic
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
37. 37.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) always 10 (d) zero
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we change it (b) we measure it (c) we keep it the same
39. 39.⚖️ 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) where the pencil is
40. 40.True or false: a slide is an inclined plane. (a) False (b) True

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