Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 867 · 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 12 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
2. 2.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a see-saw (c) a well pulley (d) a sloping road
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 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?
4. 4.⚖️ 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 kind of coins
5. 5.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit on the middle (d) sit farther from middle
6. 6.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
7. 7.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) press it gently (d) bend it till it snaps
8. 8.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
9. 9.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
10. 10.True or false: a sloping road is a lever. (a) True (b) False
11. 11.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
12. 12.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) bigger on the left (c) equal on both sides (d) zero
13. 13.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is what we measure. (a) True (b) False
15. 15.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a round pencil (d) a flat table
16. 16.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
17. 17.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
18. 18.True or false: a spoon lifting a lid is a lever. (a) True (b) False
19. 19.⚖️ 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
20. 20.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 10 cm to the left of the pencil. How many coins must you place 10 cm to the right to balance it?
21. 21.True or false: yeast is not needed for the ruler lever. (a) False (b) True
22. 22.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) a mirror
23. 23.True or false: a mirror is needed for the ruler lever. (a) False (b) True
24. 24.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the spoon is magnetic (c) a lever boosts your push (d) the lid gets softer
25. 25.True or false: a tap handle is an inclined plane. (a) True (b) False
26. 26.True or false: a crane uses a pulley. (a) False (b) True
27. 27.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
28. 28.⚖️ 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
29. 29.True or false: a bottle opener is an inclined plane. (a) True (b) False
30. 30.⚙️ Which of these is a wheel and axle? (a) a slide (b) a spoon lifting a lid (c) a doorknob (d) a crowbar
31. 31.⚖️ 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 keep it the same (c) we change it
32. 32.⚖️ 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 change it (c) we keep it the same
33. 33.True or false: yeast is needed for the ruler lever. (a) False (b) True
34. 34.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) a balloon (d) a round pencil
35. 35.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a battery cell (d) a 30 cm ruler
36. 36.⚖️ 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) which side goes down (c) the number of coins
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
38. 38.True or false: a spoon lifting a lid is a wheel and axle. (a) True (b) False
39. 39.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) harder (d) easier
40. 40.⚙️ Which simple machine is a steering wheel? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane

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