Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 401 · 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 the one thing we change. (a) True (b) False
2. 2.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) the same (d) impossible
3. 3.⚙️ Which of these uses a pulley? (a) a tap handle (b) a sloping road (c) a spoon lifting a lid (d) a well pulley
4. 4.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a slide (c) a ramp (d) a tap handle
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
6. 6.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
7. 7.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
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) the same ruler (b) which side goes down (c) distance from the pencil (d) the number of coins
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
10. 10.⚙️ Which of these is a lever? (a) a doorknob (b) a crane (c) a see-saw (d) a steering wheel
11. 11.⚖️ 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 keep it the same (b) we change it (c) we measure it
12. 12.⚙️ Which simple machine is a crowbar? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
13. 13.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are magnetic (d) they are too shiny
14. 14.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
15. 15.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) stand on the ruler (d) press it gently
16. 16.True or false: a see-saw uses a pulley. (a) False (b) True
17. 17.⚖️ 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 same ruler (c) which side goes down
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a mirror (d) coins of one kind
19. 19.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
20. 20.⚙️ Which of these is a lever? (a) a crane (b) a bottle opener (c) a well pulley (d) a doorknob
21. 21.🧺 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) yeast
22. 22.⚖️ 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 keep it the same (c) we change it
23. 23.⚖️ What is the turning point of a lever called? (a) the axle (b) the effort (c) the load (d) the fulcrum
24. 24.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
25. 25.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
26. 26.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a flat table (c) a battery cell (d) turmeric powder
27. 27.True or false: a doorknob is a lever. (a) True (b) False
28. 28.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a balloon (c) a battery cell (d) a round pencil
29. 29.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit farther from middle (c) sit on the middle (d) jump up and down
30. 30.⚖️ 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 change it (b) we measure it (c) we keep it the same
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 10 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
32. 32.⚖️ 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
33. 33.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a well pulley (c) a ramp (d) a spoon lifting a lid
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
35. 35.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
37. 37.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) coins of one kind (c) a round pencil (d) a magnet
38. 38.True or false: a steering wheel is a lever. (a) True (b) False
39. 39.⚖️ 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) True (b) False
40. 40.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True

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