Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 744 · 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) the number of coins (b) which side goes down (c) distance from the pencil
2. 2.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
3. 3.⚖️ 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) where the pencil is
4. 4.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a magnet (c) coins of one kind (d) a 30 cm ruler
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) coins of one kind (d) a battery cell
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) yeast (d) a flat table
7. 7.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a crane (c) a steering wheel (d) a sloping road
8. 8.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a ramp (c) a well pulley (d) a tap handle
9. 9.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
10. 10.True or false: a steering wheel uses a pulley. (a) True (b) False
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
12. 12.⚙️ Which simple machine is a crane? (a) a wheel and axle (b) a pulley (c) a lever (d) an inclined plane
13. 13.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) a lever boosts your push (c) the spoon is magnetic (d) the spoon is hot
14. 14.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) always 10 (d) equal on both sides
15. 15.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
16. 16.True or false: turmeric powder is not needed for the ruler lever. (a) True (b) False
17. 17.⚖️ What is the turning point of a lever called? (a) the effort (b) the fulcrum (c) the axle (d) the load
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a 30 cm ruler (c) a magnet (d) a round pencil
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 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?
20. 20.⚙️ Which of these is a lever? (a) a slide (b) a crowbar (c) a steering wheel (d) a doorknob
21. 21.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
22. 22.True or false: a magnet is needed for the ruler lever. (a) True (b) False
23. 23.True or false: a spoon lifting a lid is a lever. (a) False (b) True
24. 24.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too shiny (c) they are too cold (d) they are magnetic
25. 25.🔮 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) both go up (c) neither, it balances (d) the left side
26. 26.🛟 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
27. 27.🧺 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 mirror (d) a round pencil
28. 28.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a 30 cm ruler (c) a mirror (d) a balloon
29. 29.⚖️ 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) distance from the pencil (c) the kind of coins (d) the number of coins
30. 30.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 2 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
32. 32.True or false: a slide uses a pulley. (a) False (b) True
33. 33.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a mirror (c) yeast (d) coins of one kind
34. 34.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) the same (c) easier (d) harder
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the number of coins (b) which side goes down (c) distance from the pencil (d) where the pencil is
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
37. 37.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
38. 38.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
39. 39.True or false: a flat table is needed for the ruler lever. (a) False (b) True
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 2 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?

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