Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 400 · 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.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
2. 2.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
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) which side goes down (b) the number of coins (c) the kind of coins (d) distance from the pencil
4. 4.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
5. 5.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) True (b) False
7. 7.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they are magnetic (d) they may swallow them
8. 8.⚙️ Which of these uses a pulley? (a) a flagpole (b) a slide (c) a ramp (d) a tap handle
9. 9.⚖️ 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
10. 10.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) turmeric powder (c) coins of one kind (d) a round pencil
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 measure it (b) we change it (c) we keep it the same
12. 12.True or false: a sloping road is an inclined plane. (a) False (b) True
13. 13.⚖️ 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 change it (b) we measure it (c) we keep it the same
14. 14.True or false: a see-saw is an inclined plane. (a) False (b) True
15. 15.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a 30 cm ruler (c) a round pencil (d) coins of one kind
16. 16.⚖️ 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 keep it the same (c) we measure it
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
18. 18.🛟 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
19. 19.True or false: a see-saw is a lever. (a) False (b) True
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a mirror (d) coins of one kind
21. 21.⚖️ 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
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 8 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
23. 23.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
24. 24.⚙️ Which simple machine is a ramp? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
25. 25.⚖️ 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
26. 26.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a bottle opener (c) a crowbar (d) a well pulley
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 4 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
28. 28.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
30. 30.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) easier (d) the same
31. 31.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) yeast (c) a battery cell (d) a mirror
32. 32.⚖️ 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) where the pencil is (c) the kind of coins (d) which side goes down
33. 33.⚖️ 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
34. 34.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
35. 35.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
36. 36.⚙️ Which of these is a lever? (a) a crane (b) a doorknob (c) a steering wheel (d) a bottle opener
37. 37.True or false: a crane uses a pulley. (a) False (b) True
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 2 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
39. 39.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) turmeric powder (c) coins of one kind (d) a flat table
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?

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