Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 581 · 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? Which of these is kept the same? (a) which side goes down (b) distance from the pencil (c) the kind of coins
2. 2.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
3. 3.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
4. 4.⚙️ Which simple machine is a well pulley? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 10 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?
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 10 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?
7. 7.True or false: a crowbar is a lever. (a) True (b) False
8. 8.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a magnet (d) a 30 cm ruler
9. 9.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) turmeric powder (d) a flat table
10. 10.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) turmeric powder (c) coins of one kind (d) a balloon
11. 11.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
12. 12.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
13. 13.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) bend it till it snaps (c) flick coins at faces (d) press it gently
14. 14.True or false: a ramp is a lever. (a) False (b) True
15. 15.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
16. 16.True or false: a spoon lifting a lid uses a pulley. (a) True (b) False
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 the one thing we change. (a) True (b) False
18. 18.⚖️ 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 same ruler (b) the number of coins (c) which side goes down (d) distance from the pencil
19. 19.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) the same (c) harder (d) impossible
20. 20.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they are too shiny (c) they may swallow them (d) they are too cold
21. 21.True or false: a crane is a wheel and axle. (a) True (b) False
22. 22.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) the left side (b) the right side (c) neither, it balances (d) both go up
23. 23.⚙️ Which simple machine is a flagpole? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
24. 24.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
25. 25.⚖️ 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 measure it (b) we change it (c) we keep it the same
26. 26.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
27. 27.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a crane (c) a flagpole (d) a doorknob
28. 28.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) bigger on the left (d) equal on both sides
29. 29.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
30. 30.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a round pencil (c) a flat table (d) coins of one kind
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) coins of one kind (d) a mirror
32. 32.True or false: yeast is not needed for the ruler lever. (a) True (b) False
33. 33.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 12 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?
34. 34.⚖️ 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 keep it the same (b) we change it (c) we measure it
35. 35.⚖️ 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) where the pencil is (c) which side goes down
36. 36.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
37. 37.⚖️ 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) True (b) False
38. 38.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil. How many coins must you place 3 cm to the right to balance it?
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a 30 cm ruler (d) a balloon

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