Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 493 · 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.True or false: a flat table is not needed for the ruler lever. (a) False (b) True
2. 2.True or false: a well pulley is a lever. (a) False (b) True
3. 3.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
4. 4.True or false: a flagpole uses a pulley. (a) True (b) False
5. 5.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
6. 6.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) where the pencil is (c) which side goes down (d) the kind of coins
7. 7.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
8. 8.⚖️ 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
9. 9.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
10. 10.🛟 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
11. 11.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) jump up and down (c) sit farther from middle (d) sit on the middle
12. 12.⚖️ 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
13. 13.⚖️ 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 measure it (b) we keep it the same (c) we change it
14. 14.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 1 cm to the left of the pencil and 1 coin on the right. How many cm from the pencil must the right-hand coins go to balance it?
15. 15.⚙️ Which of these uses a pulley? (a) a spoon lifting a lid (b) a doorknob (c) a flagpole (d) a bottle opener
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 4 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
17. 17.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
18. 18.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
19. 19.🧺 Do we need a battery cell for the ruler lever? (a) not needed (b) needed
20. 20.🔮 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 right side (b) neither, it balances (c) the left side (d) both go up
21. 21.True or false: a mirror is needed for the ruler lever. (a) True (b) False
22. 22.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) flick coins at faces (c) bend it till it snaps (d) press it gently
23. 23.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is the one thing we change. (a) False (b) True
24. 24.⚙️ Which simple machine is a spoon lifting a lid? (a) an inclined plane (b) a wheel and axle (c) a lever (d) a pulley
25. 25.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 10 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
26. 26.True or false: a crane uses a pulley. (a) True (b) False
27. 27.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a balloon (b) a round pencil (c) a 30 cm ruler (d) a flat table
28. 28.⚙️ Which of these is a wheel and axle? (a) a slide (b) a spoon lifting a lid (c) a crane (d) a doorknob
29. 29.⚖️ 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 measure it (b) we keep it the same (c) we change it
30. 30.⚖️ 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
31. 31.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a flat table (c) a round pencil (d) yeast
32. 32.True or false: a 30 cm ruler is not needed for the ruler lever. (a) False (b) True
33. 33.⚖️ 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 kind of coins (b) which side goes down (c) distance from the pencil
34. 34.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) a lever boosts your push (d) the spoon is magnetic
35. 35.⚙️ Which simple machine is a crane? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
36. 36.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a mirror (c) a battery cell (d) a 30 cm ruler
37. 37.True or false: a ramp is an inclined plane. (a) False (b) True
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) False (b) True
39. 39.🧺 Which of these is needed for the ruler lever? (a) turmeric powder (b) a flat table (c) yeast (d) a magnet
40. 40.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True

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