Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 815 · 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 not needed for the ruler lever? (a) a flat table (b) a balloon (c) a round pencil (d) coins of one kind
2. 2.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
3. 3.True or false: a doorknob is a wheel and axle. (a) True (b) False
4. 4.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
5. 5.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are too cold (c) they are magnetic (d) they may swallow them
6. 6.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 5 cm to the left of the pencil. How many coins must you place 4 cm to the right to balance it?
7. 7.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a battery cell (c) a 30 cm ruler (d) turmeric powder
8. 8.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit closer to middle (b) sit farther from middle (c) sit on the middle (d) jump up and down
9. 9.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
10. 10.True or false: yeast is needed for the ruler lever. (a) False (b) True
11. 11.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) stand on the ruler (c) flick coins at faces (d) press it gently
12. 12.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a mirror (c) a round pencil (d) coins of one kind
13. 13.⚖️ 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 change it (c) we keep it the same
14. 14.⚙️ Which of these is an inclined plane? (a) a ramp (b) a spoon lifting a lid (c) a crowbar (d) a bottle opener
15. 15.True or false: a see-saw is a lever. (a) False (b) True
16. 16.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) the same ruler (b) which side goes down (c) distance from the pencil (d) the number of coins
17. 17.True or false: a crowbar uses a pulley. (a) False (b) True
18. 18.⚙️ Which of these is an inclined plane? (a) a well pulley (b) a tap handle (c) a bottle opener (d) a sloping road
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 what we measure. (a) True (b) False
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is kept the same. (a) True (b) False
21. 21.⚖️ 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 measure it (c) we change it
22. 22.True or false: a crowbar is a wheel and axle. (a) False (b) True
23. 23.🔮 Predict: 2 coins sit 5 cm left of the pencil and 2 coins sit 10 cm right of it. Which side goes down? (a) neither, it balances (b) the left side (c) both go up (d) the right side
24. 24.⚖️ 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
25. 25.⚖️ 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
26. 26.🧺 Which of these is needed for the ruler lever? (a) a round pencil (b) yeast (c) a magnet (d) a mirror
27. 27.🧺 Which of these is not needed for the ruler lever? (a) turmeric powder (b) coins of one kind (c) a flat table (d) a round pencil
28. 28.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a battery cell (c) a 30 cm ruler (d) a round pencil
29. 29.True or false: a crane is a wheel and axle. (a) False (b) True
30. 30.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
31. 31.⚖️ A ruler balances on a pencil at its middle. You place 3 coins 8 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
32. 32.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a 30 cm ruler (c) turmeric powder (d) a flat table
33. 33.⚖️ 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) the number of coins (c) distance from the pencil (d) the kind of coins
34. 34.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 3 cm to the left of the pencil. How many coins must you place 1 cm to the right to balance it?
35. 35.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the spoon is hot (b) the spoon is magnetic (c) the lid gets softer (d) a lever boosts your push
36. 36.🧺 Do we need coins of one kind for the ruler lever? (a) not needed (b) needed
37. 37.⚖️ 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 measure it (b) we keep it the same (c) we change it
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
39. 39.⚙️ Which simple machine is a see-saw? (a) an inclined plane (b) a wheel and axle (c) a pulley (d) a lever
40. 40.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the effort (c) the load (d) the axle

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