Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 520 · 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 is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) a lever boosts your push (c) the spoon is magnetic (d) the lid gets softer
2. 2.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 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?
3. 3.⚙️ Which of these is an inclined plane? (a) a steering wheel (b) a bottle opener (c) a tap handle (d) a slide
4. 4.True or false: a steering wheel uses a pulley. (a) False (b) True
5. 5.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a flat table (c) turmeric powder (d) a mirror
6. 6.⚖️ 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 keep it the same (c) we change it
7. 7.🔮 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) both go up (c) the right side (d) the left side
8. 8.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are too shiny (c) they are magnetic (d) they may swallow them
9. 9.⚖️ 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 kind of coins (c) which side goes down (d) distance from the pencil
10. 10.True or false: a ramp is a lever. (a) True (b) False
11. 11.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) equal on both sides (c) bigger on the left (d) always 10
12. 12.⚙️ Which of these is a lever? (a) a tap handle (b) a spoon lifting a lid (c) a sloping road (d) a flagpole
13. 13.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) yeast (c) a flat table (d) a 30 cm ruler
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) True (b) False
15. 15.⚖️ What is the turning point of a lever called? (a) the load (b) the axle (c) the effort (d) the fulcrum
16. 16.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) jump up and down (d) sit closer to middle
17. 17.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
18. 18.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
19. 19.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a crowbar (c) a flagpole (d) a ramp
20. 20.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) a mirror (d) coins of one kind
21. 21.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
22. 22.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 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?
23. 23.⚙️ Which simple machine is a ramp? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
24. 24.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
25. 25.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) bend it till it snaps (d) press it gently
26. 26.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a round pencil (c) coins of one kind (d) a 30 cm ruler
27. 27.⚙️ Which of these is a lever? (a) a sloping road (b) a well pulley (c) a crane (d) a bottle opener
28. 28.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) yeast (c) coins of one kind (d) a balloon
29. 29.⚖️ 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 change it (b) we measure it (c) we keep it the same
30. 30.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
31. 31.⚖️ 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
32. 32.True or false: yeast is not needed for the ruler lever. (a) True (b) False
33. 33.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a round pencil (c) a magnet (d) coins of one kind
34. 34.True or false: a see-saw is a wheel and axle. (a) False (b) True
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we keep it the same (b) we measure it (c) we change it
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 2 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a round pencil (c) coins of one kind (d) a flat table
38. 38.⚖️ 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 measure it (b) we keep it the same (c) we change it
39. 39.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is what we measure. (a) False (b) True
40. 40.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) impossible (c) the same (d) harder

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