Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 686 · 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.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) bend it till it snaps (d) flick coins at faces
2. 2.True or false: a flagpole uses a pulley. (a) True (b) False
3. 3.True or false: a crowbar is a wheel and axle. (a) True (b) False
4. 4.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) True (b) False
5. 5.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) zero (c) always 10 (d) bigger on the left
6. 6.⚙️ Which simple machine is a crowbar? (a) a wheel and axle (b) a lever (c) an inclined plane (d) a pulley
7. 7.🛟 Why should coins be kept away from very small children? (a) they are magnetic (b) they may swallow them (c) they are too shiny (d) they are too cold
8. 8.⚖️ 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) False (b) True
9. 9.True or false: a mirror is needed for the ruler lever. (a) True (b) False
10. 10.⚖️ 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) where the pencil is (b) distance from the pencil (c) the number of coins (d) the kind of coins
11. 11.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a round pencil (d) a magnet
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) coins of one kind (c) a flat table (d) a balloon
13. 13.⚖️ 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
14. 14.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
15. 15.True or false: a tap handle is a lever. (a) False (b) True
16. 16.True or false: a well pulley is a wheel and axle. (a) False (b) True
17. 17.True or false: a slide is an inclined plane. (a) False (b) True
18. 18.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a magnet (d) a flat table
19. 19.True or false: a tap handle is a wheel and axle. (a) False (b) True
20. 20.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
21. 21.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the same ruler (b) where the pencil is (c) the number of coins (d) which side goes down
22. 22.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) the same (d) impossible
23. 23.⚖️ 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 change it (b) we measure it (c) we keep it the same
24. 24.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a balloon (c) a 30 cm ruler (d) a flat table
25. 25.⚙️ Which of these is a wheel and axle? (a) a well pulley (b) a see-saw (c) a steering wheel (d) a slide
26. 26.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 6 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?
27. 27.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 3 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
29. 29.True or false: a magnet is needed for the ruler lever. (a) False (b) True
30. 30.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) yeast (c) a battery cell (d) a mirror
31. 31.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit on the middle (b) sit closer to middle (c) jump up and down (d) sit farther from middle
32. 32.⚙️ Which simple machine is a spoon lifting a lid? (a) a lever (b) an inclined plane (c) a pulley (d) a wheel and axle
33. 33.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a battery cell (d) a flat table
34. 34.⚖️ 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
35. 35.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
36. 36.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
37. 37.⚖️ 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
38. 38.True or false: yeast is needed for the ruler lever. (a) True (b) False
39. 39.⚙️ Which of these is a wheel and axle? (a) a crane (b) a ramp (c) a slide (d) a tap handle
40. 40.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) the same ruler (b) which side goes down (c) distance from the pencil

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