Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 836 · 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.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 10 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
3. 3.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) flick coins at faces (c) stand on the ruler (d) bend it till it snaps
4. 4.⚖️ 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) False (b) True
5. 5.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the effort (d) the axle
6. 6.True or false: a flat table is not needed for the ruler lever. (a) True (b) False
7. 7.True or false: a crowbar is a wheel and axle. (a) False (b) True
8. 8.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) a mirror (c) a magnet (d) turmeric powder
9. 9.⚖️ 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 4 cm to the right to balance it?
10. 10.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
11. 11.⚖️ 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) True (b) False
12. 12.⚙️ Which simple machine is a flagpole? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
13. 13.⚖️ 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 keep it the same (b) we measure it (c) we change it
14. 14.🧺 Which of these is needed for the ruler lever? (a) yeast (b) coins of one kind (c) a battery cell (d) turmeric powder
15. 15.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) always 10 (c) bigger on the left (d) equal on both sides
16. 16.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
17. 17.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) True (b) False
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 5 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
19. 19.⚖️ 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 keep it the same (c) we measure it
20. 20.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
22. 22.⚖️ 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) the number of coins (b) the same ruler (c) distance from the pencil (d) which side goes down
23. 23.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible
24. 24.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
25. 25.True or false: a well pulley uses a pulley. (a) True (b) False
26. 26.True or false: a well pulley is a wheel and axle. (a) True (b) False
27. 27.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a magnet (c) a flat table (d) a balloon
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) which side goes down (c) the number of coins (d) the same ruler
29. 29.True or false: a flagpole is a wheel and axle. (a) True (b) False
30. 30.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
31. 31.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) jump up and down (c) sit closer to middle (d) sit on the middle
32. 32.True or false: a spoon lifting a lid is a lever. (a) True (b) False
33. 33.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) False (b) True
34. 34.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they are magnetic (d) they may swallow them
35. 35.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
36. 36.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a flagpole (c) a crane (d) a ramp
37. 37.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
38. 38.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
39. 39.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
40. 40.True or false: a steering wheel uses a pulley. (a) False (b) True

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