Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 629 · 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.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
2. 2.True or false: a well pulley is an inclined plane. (a) True (b) False
3. 3.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) yeast (c) coins of one kind (d) a 30 cm ruler
4. 4.⚙️ Which of these uses a pulley? (a) a bottle opener (b) a doorknob (c) a crane (d) a tap handle
5. 5.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) turmeric powder (c) a round pencil (d) a battery cell
6. 6.True or false: a magnet is needed for the ruler lever. (a) True (b) False
7. 7.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) impossible (d) harder
8. 8.True or false: a balloon is needed for the ruler lever. (a) False (b) True
9. 9.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) both go up (b) neither, it balances (c) the right side (d) the left side
10. 10.⚙️ Which simple machine is a crowbar? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
11. 11.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) a mirror (d) a balloon
12. 12.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
13. 13.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the spoon is magnetic (c) the lid gets softer (d) a lever boosts your push
14. 14.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
15. 15.⚙️ Which simple machine is a slide? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
16. 16.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) bend it till it snaps (c) stand on the ruler (d) press it gently
17. 17.⚙️ Which of these is a lever? (a) a steering wheel (b) a bottle opener (c) a crane (d) a flagpole
18. 18.⚙️ Which of these is a lever? (a) a flagpole (b) a crowbar (c) a well pulley (d) a tap handle
19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) coins of one kind (c) a flat table (d) a 30 cm ruler
20. 20.⚖️ 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 measure it (b) we keep it the same (c) we change it
21. 21.⚖️ 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
22. 22.⚖️ 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 keep it the same (b) we measure it (c) we change it
23. 23.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a mirror (c) a flat table (d) yeast
24. 24.True or false: a balloon is not needed for the ruler lever. (a) False (b) True
25. 25.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
26. 26.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) coins of one kind (c) a balloon (d) a mirror
27. 27.⚖️ 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 same ruler (c) which side goes down
28. 28.⚖️ 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
29. 29.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 5 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
30. 30.⚖️ 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) True (b) False
31. 31.⚖️ 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
32. 32.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
33. 33.True or false: a ramp is an inclined plane. (a) True (b) False
34. 34.⚖️ 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) True (b) False
35. 35.⚙️ Which simple machine is a steering wheel? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
36. 36.🛟 Why should coins be kept away from very small children? (a) they may swallow them (b) they are too cold (c) they are magnetic (d) they are too shiny
37. 37.⚖️ 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 change it (c) we keep it the same
38. 38.True or false: a crane uses a pulley. (a) False (b) True
39. 39.🧺 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 round pencil (d) a magnet
40. 40.⚙️ Which of these is a wheel and axle? (a) a bottle opener (b) a crowbar (c) a doorknob (d) a ramp

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