Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 710 · 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.🛟 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
2. 2.⚖️ 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 measure it (c) we change it
3. 3.⚙️ Which simple machine is a tap handle? (a) a wheel and axle (b) a lever (c) a pulley (d) an inclined plane
4. 4.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) turmeric powder (b) a round pencil (c) coins of one kind (d) a flat table
5. 5.True or false: a 30 cm ruler is not needed for the ruler lever. (a) True (b) False
6. 6.⚙️ Which of these is a wheel and axle? (a) a crane (b) a see-saw (c) a sloping road (d) a doorknob
7. 7.True or false: a battery cell is needed for the ruler lever. (a) True (b) False
8. 8.⚙️ Which of these is a wheel and axle? (a) a tap handle (b) a bottle opener (c) a spoon lifting a lid (d) a crane
9. 9.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are too cold (d) they are magnetic
10. 10.🔮 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 right side (c) the left side (d) both go up
11. 11.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is magnetic (c) a lever boosts your push (d) the spoon is hot
12. 12.True or false: a see-saw is a wheel and axle. (a) True (b) False
13. 13.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
14. 14.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) distance from the pencil (c) where the pencil is
15. 15.⚖️ 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 number of coins (b) distance from the pencil (c) the same ruler (d) which side goes down
16. 16.⚖️ 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 measure it (c) we change it
17. 17.True or false: a magnet is not needed for the ruler lever. (a) True (b) False
18. 18.🧺 Which of these is not needed for the ruler lever? (a) a 30 cm ruler (b) a battery cell (c) coins of one kind (d) a flat table
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 2 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?
20. 20.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
21. 21.True or false: a doorknob is a wheel and axle. (a) False (b) True
22. 22.True or false: a spoon lifting a lid is a lever. (a) False (b) True
23. 23.🧺 Do we need a battery cell for the ruler lever? (a) needed (b) not needed
24. 24.⚖️ 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) True (b) False
25. 25.⚖️ 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 kind of coins (b) where the pencil is (c) the number of coins (d) distance from the pencil
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) which side goes down (c) distance from the pencil
27. 27.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is kept the same. (a) False (b) True
28. 28.True or false: a crane uses a pulley. (a) True (b) False
29. 29.⚙️ Which simple machine is a bottle opener? (a) a wheel and axle (b) a pulley (c) an inclined plane (d) a lever
30. 30.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
31. 31.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
32. 32.⚙️ Which simple machine is a well pulley? (a) a pulley (b) a lever (c) a wheel and axle (d) an inclined plane
33. 33.🧺 Which of these is not needed for the ruler lever? (a) a flat table (b) a mirror (c) a 30 cm ruler (d) coins of one kind
34. 34.True or false: coins of one kind is not needed for the ruler lever. (a) False (b) True
35. 35.True or false: a ramp is a wheel and axle. (a) False (b) True
36. 36.⚖️ 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
37. 37.True or false: yeast is not needed for the ruler lever. (a) True (b) False
38. 38.⚖️ 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
39. 39.⚖️ Coins on the two sides balance when coins × distance is ___. (a) bigger on the left (b) zero (c) always 10 (d) equal on both sides
40. 40.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a round pencil (c) a flat table (d) a magnet

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