Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 545 · 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.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 10 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
2. 2.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) coins of one kind (c) a flat table (d) a mirror
3. 3.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit on the middle (c) sit farther from middle (d) jump up and down
4. 4.⚖️ 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) the number of coins (d) distance from the pencil
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the kind of coins is kept the same. (a) False (b) True
6. 6.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) turmeric powder (c) a 30 cm ruler (d) a round pencil
7. 7.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
8. 8.⚙️ Which of these is an inclined plane? (a) a see-saw (b) a crane (c) a slide (d) a doorknob
9. 9.⚖️ 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
10. 10.⚖️ 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
11. 11.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 10 cm to the left of the pencil and 5 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
12. 12.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
13. 13.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) distance from the pencil (c) where the pencil is
14. 14.True or false: a well pulley is a wheel and axle. (a) True (b) False
15. 15.⚖️ A ruler balances on a pencil at its middle. You place 5 coins 6 cm to the left of the pencil. How many coins must you place 5 cm to the right to balance it?
16. 16.True or false: a flagpole is an inclined plane. (a) False (b) True
17. 17.True or false: yeast is needed for the ruler lever. (a) True (b) False
18. 18.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
19. 19.⚖️ 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
20. 20.True or false: coins of one kind is not needed for the ruler lever. (a) True (b) False
21. 21.⚙️ Which simple machine is a slide? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
22. 22.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) coins of one kind (d) a balloon
23. 23.🧺 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) coins of one kind
24. 24.⚙️ Which of these is a wheel and axle? (a) a ramp (b) a tap handle (c) a sloping road (d) a well pulley
25. 25.⚖️ 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
26. 26.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
27. 27.⚖️ 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 change it (b) we measure it (c) we keep it the same
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 8 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
29. 29.⚖️ 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
30. 30.🛟 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
31. 31.🧺 Do we need a balloon for the ruler lever? (a) not needed (b) needed
32. 32.⚖️ 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
33. 33.True or false: a mirror is needed for the ruler lever. (a) True (b) False
34. 34.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a battery cell (c) a 30 cm ruler (d) turmeric powder
35. 35.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
36. 36.🔮 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) the right side (d) both go up
37. 37.⚙️ Which simple machine is a flagpole? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
38. 38.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) yeast (c) turmeric powder (d) a battery cell
39. 39.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
40. 40.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a 30 cm ruler (c) a magnet (d) a round pencil

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