Lever Experiment Worksheet

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

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