Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 330 · 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: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) easier (d) harder
2. 2.True or false: a crowbar uses a pulley. (a) False (b) True
3. 3.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too cold (c) they may swallow them (d) they are too shiny
4. 4.🧺 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 balloon (d) a round pencil
5. 5.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a crane (c) a bottle opener (d) a flagpole
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) yeast (d) a round pencil
7. 7.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) flick coins at faces (d) press it gently
8. 8.⚖️ 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 measure it (b) we keep it the same (c) we change it
9. 9.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) the spoon is magnetic (d) a lever boosts your push
10. 10.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
11. 11.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a flat table (c) coins of one kind (d) a 30 cm ruler
13. 13.🔮 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) neither, it balances (c) the right side (d) both go up
14. 14.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
15. 15.True or false: a slide is an inclined plane. (a) True (b) False
16. 16.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a magnet (c) coins of one kind (d) a mirror
17. 17.🧺 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 flat table (d) a battery cell
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 simple machine is a sloping road? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
20. 20.True or false: a magnet is needed for the ruler lever. (a) True (b) False
21. 21.⚙️ Which simple machine is a crane? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
22. 22.⚖️ 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 keep it the same (c) we change it
23. 23.⚖️ 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 measure it (b) we change it (c) we keep it the same
24. 24.⚙️ Which simple machine is a doorknob? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
25. 25.⚙️ Which simple machine is a flagpole? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
26. 26.True or false: a sloping road is a wheel and axle. (a) True (b) False
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 3 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
28. 28.True or false: yeast is not needed for the ruler lever. (a) False (b) True
29. 29.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
30. 30.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
31. 31.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
32. 32.⚙️ Which of these uses a pulley? (a) a crowbar (b) a doorknob (c) a see-saw (d) a crane
33. 33.⚖️ 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
34. 34.True or false: a mirror is needed for the ruler lever. (a) True (b) False
35. 35.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
36. 36.⚖️ 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 keep it the same (c) we measure it
37. 37.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a 30 cm ruler (d) turmeric powder
38. 38.⚖️ 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 kind of coins (c) which side goes down
39. 39.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
40. 40.⚙️ Which of these is a lever? (a) a bottle opener (b) a flagpole (c) a well pulley (d) a slide

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