Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 199 · 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.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
2. 2.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a ramp (c) a well pulley (d) a crowbar
3. 3.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a magnet (c) a round pencil (d) a mirror
4. 4.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) a flat table (c) turmeric powder (d) a battery cell
5. 5.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a bottle opener (c) a slide (d) a crane
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is kept the same. (a) True (b) False
7. 7.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
8. 8.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 8 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
10. 10.True or false: turmeric powder is needed for the ruler lever. (a) True (b) False
11. 11.⚖️ 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 keep it the same (b) we measure it (c) we change it
12. 12.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
13. 13.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 6 cm to the left of the pencil and 3 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
15. 15.⚖️ 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 keep it the same (c) we change it
16. 16.⚖️ 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) True (b) False
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) yeast (d) a 30 cm ruler
18. 18.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) coins of one kind (c) a round pencil (d) a mirror
19. 19.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) press it gently (d) flick coins at faces
20. 20.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is magnetic (b) the lid gets softer (c) a lever boosts your push (d) the spoon is hot
21. 21.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
22. 22.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) impossible (d) easier
23. 23.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) a flat table (d) a balloon
24. 24.⚙️ Which simple machine is a spoon lifting a lid? (a) a wheel and axle (b) an inclined plane (c) a pulley (d) a lever
25. 25.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) where the pencil is (b) the number of coins (c) the kind of coins (d) which side goes down
26. 26.⚙️ Which of these is an inclined plane? (a) a sloping road (b) a see-saw (c) a spoon lifting a lid (d) a bottle opener
27. 27.True or false: a ramp is an inclined plane. (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 kind of coins is kept the same. (a) False (b) True
29. 29.⚙️ Which simple machine is a crane? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
30. 30.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit on the middle (c) sit farther from middle (d) sit closer to middle
31. 31.🔮 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) neither, it balances (d) the right side
32. 32.True or false: a mirror is not needed for the ruler lever. (a) False (b) True
33. 33.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are too shiny (d) they are magnetic
34. 34.⚙️ Which simple machine is a slide? (a) an inclined plane (b) a lever (c) a wheel and axle (d) a pulley
35. 35.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 4 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
36. 36.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a slide (c) a flagpole (d) a doorknob
37. 37.🧺 Do we need a magnet for the ruler lever? (a) not needed (b) needed
38. 38.True or false: a doorknob is a wheel and axle. (a) True (b) False
39. 39.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
40. 40.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) turmeric powder (c) coins of one kind (d) a 30 cm ruler

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