Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 739 · 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 lever? (a) a crane (b) a flagpole (c) a crowbar (d) a sloping road
2. 2.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a flat table (c) a round pencil (d) a mirror
3. 3.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) press it gently (d) bend it till it snaps
4. 4.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
5. 5.🔮 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) the left side (c) the right side (d) neither, it balances
6. 6.⚙️ Which of these uses a pulley? (a) a sloping road (b) a well pulley (c) a doorknob (d) a steering wheel
7. 7.⚙️ Which simple machine is a sloping road? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
8. 8.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a battery cell (b) a flat table (c) coins of one kind (d) a round pencil
9. 9.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
10. 10.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit closer to middle (c) sit on the middle (d) jump up and down
11. 11.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
12. 12.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a flat table (d) a magnet
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.⚖️ 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 number of coins (b) the kind of coins (c) which side goes down (d) distance from the pencil
15. 15.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
16. 16.True or false: yeast is not needed for the ruler lever. (a) True (b) False
17. 17.True or false: a tap handle is a lever. (a) True (b) False
18. 18.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
19. 19.⚙️ Which simple machine is a doorknob? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
20. 20.🧺 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) turmeric powder
21. 21.⚖️ 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) False (b) True
22. 22.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) a lever boosts your push (c) the spoon is magnetic (d) the spoon is hot
23. 23.True or false: a see-saw is a lever. (a) True (b) False
24. 24.⚙️ Which simple machine is a flagpole? (a) a lever (b) a wheel and axle (c) a pulley (d) an inclined plane
25. 25.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a balloon (c) a flat table (d) coins of one kind
26. 26.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a 30 cm ruler (d) a balloon
27. 27.True or false: a doorknob is a wheel and axle. (a) True (b) False
28. 28.⚖️ 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
29. 29.⚖️ 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 keep it the same (b) we change it (c) we measure it
30. 30.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) a round pencil (c) yeast (d) a magnet
31. 31.⚙️ Which of these is an inclined plane? (a) a crane (b) a see-saw (c) a ramp (d) a tap handle
32. 32.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) yeast (c) coins of one kind (d) a flat table
33. 33.🧺 Which of these is needed for the ruler lever? (a) a 30 cm ruler (b) a magnet (c) a mirror (d) a balloon
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 6 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
35. 35.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) an inclined plane (c) a lever (d) a wheel and axle
36. 36.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a round pencil (c) coins of one kind (d) a battery cell
37. 37.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 4 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
38. 38.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) harder (c) easier (d) impossible
39. 39.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
40. 40.True or false: a spoon lifting a lid is a wheel and axle. (a) False (b) True

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