Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 158 · 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.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) sit closer to middle (d) jump up and down
2. 2.🔮 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) the right side (c) neither, it balances (d) both go up
3. 3.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
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) which side goes down (d) distance from the pencil
5. 5.🧺 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 battery cell (d) a round pencil
6. 6.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a flat table (c) a balloon (d) a mirror
7. 7.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a pulley (c) a lever (d) a wheel and axle
8. 8.🧺 Do we need a round pencil for the ruler lever? (a) needed (b) not needed
9. 9.🧺 Which of these is not needed for the ruler lever? (a) yeast (b) a 30 cm ruler (c) coins of one kind (d) a flat table
10. 10.🧺 Do we need yeast for the ruler lever? (a) needed (b) not needed
11. 11.🧺 Do we need turmeric powder for the ruler lever? (a) needed (b) not needed
12. 12.True or false: a balloon is needed for the ruler lever. (a) True (b) False
13. 13.True or false: a slide is an inclined plane. (a) True (b) False
14. 14.True or false: a crowbar is a lever. (a) False (b) True
15. 15.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) bend it till it snaps (d) press it gently
16. 16.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle
17. 17.⚙️ Which of these is a lever? (a) a spoon lifting a lid (b) a steering wheel (c) a sloping road (d) a flagpole
18. 18.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a 30 cm ruler (c) a balloon (d) yeast
19. 19.True or false: a see-saw is a lever. (a) False (b) True
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 change it (b) we measure it (c) we keep it the same
21. 21.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
22. 22.⚙️ Which simple machine is a ramp? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the number of coins”? (a) we keep it the same (b) we measure it (c) we change it
24. 24.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 1 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 5 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
26. 26.⚖️ 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 number of coins (b) distance from the pencil (c) which side goes down
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a mirror (b) a round pencil (c) a flat table (d) a 30 cm ruler
28. 28.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a magnet (d) a flat table
29. 29.⚙️ Which of these is an inclined plane? (a) a tap handle (b) a steering wheel (c) a well pulley (d) a ramp
30. 30.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a balloon (c) yeast (d) a battery cell
31. 31.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) a lever boosts your push (b) the spoon is magnetic (c) the lid gets softer (d) the spoon is hot
32. 32.⚖️ 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) False (b) True
33. 33.⚖️ 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 keep it the same (b) we change it (c) we measure it
34. 34.⚖️ 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
35. 35.⚙️ Which simple machine is a tap handle? (a) a lever (b) a pulley (c) an inclined plane (d) a wheel and axle
36. 36.⚙️ Which simple machine is a crane? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
37. 37.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
38. 38.⚖️ 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 change it (c) we measure it
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 8 cm to the left of the pencil and 4 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
40. 40.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed

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