Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 166 · 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.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) easier (b) harder (c) the same (d) impossible
2. 2.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
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 the one thing we change. (a) True (b) False
4. 4.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
5. 5.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit farther from middle (c) sit closer to middle (d) jump up and down
6. 6.⚖️ What is the turning point of a lever called? (a) the load (b) the effort (c) the axle (d) the fulcrum
7. 7.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
8. 8.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) bend it till it snaps (c) flick coins at faces (d) stand on the ruler
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) distance from the pencil (b) the kind of coins (c) the same ruler (d) the number of coins
10. 10.⚖️ 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
11. 11.⚙️ Which simple machine is a doorknob? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
12. 12.⚖️ 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 change it (b) we measure it (c) we keep it the same
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 measure it (b) we change it (c) we keep it the same
14. 14.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) coins of one kind (d) yeast
15. 15.True or false: a crowbar is a wheel and axle. (a) False (b) True
16. 16.⚙️ Which of these uses a pulley? (a) a sloping road (b) a flagpole (c) a spoon lifting a lid (d) a doorknob
17. 17.True or false: a flagpole uses a pulley. (a) True (b) False
18. 18.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) True (b) False
19. 19.⚖️ 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) which side goes down (c) where the pencil is
20. 20.🧺 Which of these is needed for the ruler lever? (a) a flat table (b) a balloon (c) a battery cell (d) a mirror
21. 21.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
22. 22.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) False (b) True
24. 24.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
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 left side (b) neither, it balances (c) both go up (d) the right side
26. 26.True or false: a round pencil is needed for the ruler lever. (a) False (b) True
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is what we measure. (a) False (b) True
28. 28.True or false: a balloon is needed for the ruler lever. (a) False (b) True
29. 29.⚙️ Which of these uses a pulley? (a) a ramp (b) a tap handle (c) a steering wheel (d) a well pulley
30. 30.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a magnet (c) a 30 cm ruler (d) yeast
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
32. 32.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a flat table (c) a 30 cm ruler (d) a round pencil
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 1 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?
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) False (b) True
36. 36.True or false: a bottle opener is a wheel and axle. (a) False (b) True
37. 37.🛟 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
38. 38.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a round pencil (c) a flat table (d) a 30 cm ruler
39. 39.⚖️ 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
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 2 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?

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