Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 756 · 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.⚙️ Which of these is a lever? (a) a doorknob (b) a crane (c) a bottle opener (d) a slide
2. 2.🔮 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) the left side (d) both go up
3. 3.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) True (b) False
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 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?
5. 5.⚖️ 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) which side goes down (b) distance from the pencil (c) the same ruler (d) the kind of coins
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 5 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.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a flat table (c) a battery cell (d) a round pencil
8. 8.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
9. 9.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) bend it till it snaps (c) stand on the ruler (d) flick coins at faces
10. 10.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
11. 11.⚙️ Which simple machine is a doorknob? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a mirror (d) a 30 cm ruler
13. 13.⚖️ 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 keep it the same (b) we measure it (c) we change it
14. 14.🧺 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
15. 15.True or false: a doorknob is a lever. (a) False (b) True
16. 16.⚖️ 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?
17. 17.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a round pencil (c) a magnet (d) a mirror
18. 18.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the spoon is hot (c) the lid gets softer (d) a lever boosts your push
19. 19.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
20. 20.⚙️ Which of these uses a pulley? (a) a well pulley (b) a tap handle (c) a ramp (d) a spoon lifting a lid
21. 21.⚖️ 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 change it (c) we keep it the same
22. 22.True or false: a battery cell is not needed for the ruler lever. (a) True (b) False
23. 23.⚖️ 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) True (b) False
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 3 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
25. 25.True or false: a tap handle is a wheel and axle. (a) False (b) True
26. 26.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) True (b) False
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 8 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
28. 28.⚙️ Which of these is an inclined plane? (a) a bottle opener (b) a flagpole (c) a tap handle (d) a sloping road
29. 29.True or false: a sloping road uses a pulley. (a) False (b) True
30. 30.⚖️ 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
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) a flat table (c) a round pencil (d) a 30 cm ruler
32. 32.True or false: a see-saw is an inclined plane. (a) True (b) False
33. 33.True or false: a crowbar uses a pulley. (a) False (b) True
34. 34.⚖️ 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?
35. 35.⚙️ Which of these is a wheel and axle? (a) a well pulley (b) a doorknob (c) a spoon lifting a lid (d) a ramp
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 8 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
37. 37.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
38. 38.⚙️ Which of these is a wheel and axle? (a) a spoon lifting a lid (b) a crowbar (c) a flagpole (d) a tap handle
39. 39.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too cold (d) they are too shiny
40. 40.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) zero (c) bigger on the left (d) always 10

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