Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 918 · 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.⚖️ 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) False (b) True
2. 2.⚙️ Which simple machine is a sloping road? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
3. 3.⚙️ Which of these is an inclined plane? (a) a sloping road (b) a doorknob (c) a crowbar (d) a well pulley
4. 4.⚙️ Which of these uses a pulley? (a) a flagpole (b) a sloping road (c) a bottle opener (d) a see-saw
5. 5.⚙️ Which simple machine is a ramp? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a round pencil (c) a flat table (d) coins of one kind
7. 7.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 5 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
8. 8.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 12 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
9. 9.⚙️ Which simple machine is a see-saw? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
10. 10.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) harder (d) easier
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
12. 12.⚖️ 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
13. 13.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) press it gently (d) stand on the ruler
14. 14.True or false: a flagpole is a wheel and axle. (a) True (b) False
15. 15.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
16. 16.True or false: yeast is needed for the ruler lever. (a) True (b) False
17. 17.⚙️ Which simple machine is a flagpole? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
18. 18.🧺 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) turmeric powder
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 4 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?
20. 20.⚖️ 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
21. 21.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
22. 22.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
23. 23.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
24. 24.⚙️ Which simple machine is a crowbar? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
25. 25.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a flat table (c) a mirror (d) a balloon
26. 26.True or false: a spoon lifting a lid is a wheel and axle. (a) True (b) False
27. 27.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the axle (d) the load
28. 28.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit closer to middle (c) sit farther from middle (d) sit on the middle
29. 29.True or false: a mirror is needed for the ruler lever. (a) False (b) True
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the same ruler”? (a) we change it (b) we measure it (c) we keep it the same
31. 31.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a mirror (c) a balloon (d) a round pencil
32. 32.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
33. 33.True or false: a crowbar is a lever. (a) False (b) True
34. 34.⚙️ Which simple machine is a slide? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
35. 35.True or false: a well pulley uses a pulley. (a) False (b) True
36. 36.⚙️ Which of these uses a pulley? (a) a crane (b) a crowbar (c) a slide (d) a ramp
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) the same ruler (b) distance from the pencil (c) which side goes down
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.🛟 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
40. 40.True or false: a round pencil is needed for the ruler lever. (a) False (b) True

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