Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 860 · 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.⚖️ 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
2. 2.⚖️ 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
3. 3.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) coins of one kind (c) a 30 cm ruler (d) a flat table
4. 4.⚖️ 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 change it (c) we measure it
5. 5.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the lid gets softer (c) the spoon is magnetic (d) a lever boosts your push
6. 6.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) flick coins at faces (d) bend it till it snaps
7. 7.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a flat table (c) a 30 cm ruler (d) a round pencil
8. 8.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a mirror (c) a 30 cm ruler (d) a round pencil
9. 9.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
10. 10.True or false: a doorknob uses a pulley. (a) True (b) False
11. 11.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a round pencil (d) a battery cell
13. 13.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the axle (c) the load (d) the effort
14. 14.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
15. 15.True or false: a doorknob is an inclined plane. (a) False (b) True
16. 16.⚖️ 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?
17. 17.⚖️ 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 kind of coins (b) the same ruler (c) the number of coins (d) distance from the pencil
18. 18.⚙️ Which of these uses a pulley? (a) a well pulley (b) a tap handle (c) a slide (d) a sloping road
19. 19.True or false: a slide is an inclined plane. (a) True (b) False
20. 20.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
21. 21.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) which side goes down (b) the kind of coins (c) the number of coins (d) where the pencil is
22. 22.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
23. 23.⚖️ 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) the number of coins (c) distance from the pencil
24. 24.🛟 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
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 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?
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
27. 27.🔮 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 right side (b) the left side (c) both go up (d) neither, it balances
28. 28.⚖️ 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 keep it the same (b) we change it (c) we measure it
29. 29.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
30. 30.True or false: a sloping road is an inclined plane. (a) True (b) False
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a battery cell (d) a flat table
32. 32.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a battery cell (c) yeast (d) a 30 cm ruler
33. 33.True or false: a crane uses a pulley. (a) True (b) False
34. 34.True or false: a flat table is needed for the ruler lever. (a) True (b) False
35. 35.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
36. 36.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a battery cell (c) turmeric powder (d) coins of one kind
37. 37.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
38. 38.⚙️ Which simple machine is a well pulley? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
39. 39.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a battery cell (c) a round pencil (d) a balloon
40. 40.True or false: a tap handle uses a pulley. (a) False (b) True

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