Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 283 · 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 wheel and axle? (a) a doorknob (b) a crane (c) a flagpole (d) a crowbar
2. 2.🧺 Do we need a flat table for the ruler lever? (a) needed (b) not needed
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a mirror (c) a round pencil (d) a flat table
4. 4.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
5. 5.🧺 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 30 cm ruler (d) a balloon
6. 6.⚖️ 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
7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
8. 8.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
10. 10.🔮 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
11. 11.True or false: a mirror is needed for the ruler lever. (a) True (b) False
12. 12.True or false: a 30 cm ruler is needed for the ruler lever. (a) False (b) True
13. 13.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit farther from middle (d) sit on the middle
14. 14.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
15. 15.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a flat table (c) coins of one kind (d) a 30 cm ruler
16. 16.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
17. 17.⚖️ 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?
18. 18.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the lid gets softer (c) the spoon is magnetic (d) the spoon is hot
19. 19.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) where the pencil is (b) which side goes down (c) distance from the pencil
21. 21.⚖️ 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
22. 22.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) flick coins at faces (d) press it gently
23. 23.⚙️ Which of these uses a pulley? (a) a crane (b) a steering wheel (c) a ramp (d) a sloping road
24. 24.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
25. 25.⚖️ 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?
26. 26.⚖️ 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 same ruler (d) the number of coins
27. 27.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) equal on both sides (c) zero (d) always 10
28. 28.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) harder (d) the same
29. 29.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
30. 30.True or false: a slide uses a pulley. (a) False (b) True
31. 31.⚖️ 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) the number of coins
32. 32.⚖️ 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) the kind of coins (c) which side goes down
33. 33.True or false: a crowbar is a lever. (a) True (b) False
34. 34.⚖️ 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 measure it (b) we change it (c) we keep it the same
35. 35.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a magnet (c) yeast (d) a mirror
36. 36.True or false: a balloon is needed for the ruler lever. (a) False (b) True
37. 37.True or false: a mirror is not needed for the ruler lever. (a) True (b) False
38. 38.⚙️ Which of these is a lever? (a) a sloping road (b) a ramp (c) a flagpole (d) a bottle opener
39. 39.True or false: a tap handle is a lever. (a) True (b) False
40. 40.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a doorknob (c) a bottle opener (d) a slide

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