Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 58 · 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 left side (b) the right side (c) neither, it balances (d) both go up
2. 2.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
3. 3.⚙️ Which simple machine is a well pulley? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
4. 4.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a battery cell (c) turmeric powder (d) a round pencil
5. 5.⚙️ Which of these is a lever? (a) a doorknob (b) a steering wheel (c) a spoon lifting a lid (d) a tap handle
6. 6.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a bottle opener (c) a sloping road (d) a well pulley
7. 7.⚖️ 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) the kind of coins (d) where the pencil is
8. 8.🧺 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 flat table (d) a magnet
9. 9.⚖️ 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
10. 10.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a steering wheel (c) a ramp (d) a well pulley
11. 11.True or false: a crane is an inclined plane. (a) False (b) True
12. 12.True or false: a mirror is needed for the ruler lever. (a) True (b) False
13. 13.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
14. 14.True or false: a see-saw uses a pulley. (a) True (b) False
15. 15.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
17. 17.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a battery cell (c) yeast (d) a balloon
18. 18.⚙️ Which of these is a lever? (a) a doorknob (b) a ramp (c) a crowbar (d) a crane
19. 19.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 3 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
21. 21.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) jump up and down (d) sit farther from middle
22. 22.⚙️ Which of these is a lever? (a) a doorknob (b) a tap handle (c) a see-saw (d) a steering wheel
23. 23.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
24. 24.⚙️ Which of these uses a pulley? (a) a ramp (b) a flagpole (c) a see-saw (d) a crowbar
25. 25.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
26. 26.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) flick coins at faces (d) press it gently
27. 27.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are too shiny (d) they are magnetic
28. 28.⚙️ Which simple machine is a crane? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
29. 29.True or false: a doorknob is a wheel and axle. (a) False (b) True
30. 30.🧺 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 mirror (d) a flat table
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) turmeric powder (c) coins of one kind (d) a flat table
32. 32.⚖️ 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) True (b) False
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil. How many coins must you place 2 cm to the right 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 needed for the ruler lever? (a) turmeric powder (b) a mirror (c) yeast (d) a flat table
36. 36.⚖️ 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
37. 37.⚖️ 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
38. 38.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
39. 39.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) turmeric powder
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) False (b) True

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