Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 939 · 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.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they may swallow them (d) they are too cold
2. 2.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
4. 4.⚙️ Which simple machine is a doorknob? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
5. 5.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the right side (c) both go up (d) the left side
6. 6.⚖️ 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?
7. 7.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
8. 8.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 3 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
9. 9.True or false: yeast is needed for the ruler lever. (a) False (b) True
10. 10.⚖️ 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 kind of coins (b) distance from the pencil (c) which side goes down
11. 11.⚖️ 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 change it (c) we measure it
12. 12.⚖️ 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 keep it the same (c) we measure it
13. 13.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a round pencil (c) coins of one kind (d) a flat table
15. 15.⚖️ 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
16. 16.⚙️ Which of these is an inclined plane? (a) a crowbar (b) a steering wheel (c) a ramp (d) a spoon lifting a lid
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) which side goes down (c) where the pencil is
18. 18.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) impossible (c) the same (d) easier
19. 19.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
20. 20.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
21. 21.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
22. 22.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a battery cell (c) a 30 cm ruler (d) a balloon
23. 23.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a flat table (c) a mirror (d) coins of one kind
24. 24.⚖️ 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
25. 25.⚖️ 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 on the middle (d) sit farther from middle
26. 26.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the load (d) the effort
27. 27.⚙️ Which simple machine is a crane? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
28. 28.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 5 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
30. 30.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a battery cell (c) a balloon (d) turmeric powder
31. 31.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True
32. 32.⚙️ Which of these is a wheel and axle? (a) a crane (b) a slide (c) a bottle opener (d) a doorknob
33. 33.⚖️ 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) distance from the pencil (b) the kind of coins (c) the number of coins (d) which side goes down
34. 34.⚙️ Which simple machine is a spoon lifting a lid? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
35. 35.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) a battery cell (d) a round pencil
36. 36.⚖️ 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 keep it the same (b) we measure it (c) we change it
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 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?
38. 38.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) equal on both sides (d) bigger on the left
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 what we measure. (a) False (b) True
40. 40.⚖️ 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

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