Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 913 · 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 simple machine is a crowbar? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
2. 2.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the spoon is magnetic (c) the lid gets softer (d) a lever boosts your push
3. 3.⚖️ 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 kind of coins (c) the number of coins (d) distance from the pencil
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) False (b) True
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a balloon (d) coins of one kind
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 10 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
7. 7.⚖️ 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) which side goes down (c) the kind of coins
8. 8.⚖️ 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) the same ruler (c) where the pencil is (d) distance from the pencil
9. 9.🔮 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) neither, it balances (c) the left side (d) both go up
10. 10.🛟 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
11. 11.⚙️ Which simple machine is a steering wheel? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
12. 12.True or false: a slide uses a pulley. (a) False (b) True
13. 13.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they are too cold (d) they may swallow them
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.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a well pulley (c) a slide (d) a crane
16. 16.⚖️ 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 keep it the same (c) we measure it
17. 17.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a battery cell (c) coins of one kind (d) a flat table
18. 18.⚙️ Which of these uses a pulley? (a) a flagpole (b) a crowbar (c) a bottle opener (d) a sloping road
19. 19.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) a 30 cm ruler (d) a balloon
20. 20.⚖️ 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
21. 21.True or false: a sloping road is a lever. (a) True (b) False
22. 22.⚖️ What is the turning point of a lever called? (a) the effort (b) the axle (c) the fulcrum (d) the load
23. 23.⚙️ Which of these is a lever? (a) a sloping road (b) a slide (c) a flagpole (d) a crowbar
24. 24.⚙️ Which of these uses a pulley? (a) a ramp (b) a well pulley (c) a slide (d) a crowbar
25. 25.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) harder (c) easier (d) the same
26. 26.True or false: a see-saw uses a pulley. (a) False (b) True
27. 27.⚙️ Which simple machine is a tap handle? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
28. 28.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a balloon (c) turmeric powder (d) a mirror
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) True (b) False
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) True (b) False
31. 31.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is what we measure. (a) False (b) True
32. 32.⚖️ 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
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
34. 34.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
35. 35.⚙️ Which of these is a lever? (a) a well pulley (b) a sloping road (c) a bottle opener (d) a flagpole
36. 36.⚖️ 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
37. 37.True or false: a spoon lifting a lid uses a pulley. (a) False (b) True
38. 38.🧺 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 flat table (d) yeast
39. 39.True or false: a crowbar is a lever. (a) False (b) True
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 1 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?

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