Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 335 · 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 30 cm ruler (b) coins of one kind (c) a round pencil (d) yeast
2. 2.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the axle (d) the fulcrum
3. 3.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) press it gently (c) stand on the ruler (d) bend it till it snaps
4. 4.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they are magnetic (c) they are too cold (d) they may swallow them
5. 5.True or false: a flagpole is a wheel and axle. (a) False (b) True
6. 6.True or false: a 30 cm ruler is needed for the ruler lever. (a) True (b) False
7. 7.True or false: a doorknob is an inclined plane. (a) False (b) True
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) which side goes down (b) distance from the pencil (c) the kind of coins (d) where the pencil is
9. 9.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is what we measure. (a) False (b) True
10. 10.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
11. 11.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) coins of one kind (c) a balloon (d) a mirror
12. 12.⚖️ 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 hot (c) the spoon is magnetic (d) the lid gets softer
13. 13.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a bottle opener (c) a crowbar (d) a ramp
14. 14.⚖️ 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?
15. 15.⚖️ 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
16. 16.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) a round pencil (c) a 30 cm ruler (d) a battery cell
17. 17.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) a flat table (c) a 30 cm ruler (d) turmeric powder
18. 18.⚖️ 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 change it (c) we keep it the same
19. 19.⚙️ Which simple machine is a bottle opener? (a) a lever (b) a pulley (c) a wheel and axle (d) an inclined plane
20. 20.⚙️ Which of these is an inclined plane? (a) a spoon lifting a lid (b) a ramp (c) a bottle opener (d) a steering wheel
21. 21.⚖️ A ruler balances on a pencil at its middle. You place 3 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?
22. 22.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a flat table (d) a magnet
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) the left side (b) both go up (c) neither, it balances (d) the right side
24. 24.🧺 Do we need a magnet for the ruler lever? (a) needed (b) not needed
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) which side goes down (b) distance from the pencil (c) the kind of coins (d) the number of coins
26. 26.True or false: a magnet is needed for the ruler lever. (a) True (b) False
27. 27.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
28. 28.⚙️ Which simple machine is a flagpole? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) a 30 cm ruler (c) a round pencil (d) a flat table
30. 30.⚙️ Which simple machine is a steering wheel? (a) a pulley (b) an inclined plane (c) a wheel and axle (d) a lever
31. 31.🧺 Do we need coins of one kind for the ruler lever? (a) needed (b) not needed
32. 32.⚙️ Which simple machine is a crowbar? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
33. 33.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) the same (c) easier (d) impossible
34. 34.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
35. 35.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
36. 36.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 8 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
37. 37.⚖️ 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
38. 38.⚖️ 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?
39. 39.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 5 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?
40. 40.True or false: a flat table is not needed for the ruler lever. (a) True (b) False

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