Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 559 · 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.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 4 cm to the left of the pencil and 2 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a battery cell (c) a round pencil (d) a flat table
3. 3.⚙️ Which simple machine is a bottle opener? (a) an inclined plane (b) a lever (c) a pulley (d) a wheel and axle
4. 4.⚖️ 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) True (b) False
5. 5.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
6. 6.⚙️ Which of these is a lever? (a) a crane (b) a flagpole (c) a tap handle (d) a spoon lifting a lid
7. 7.⚙️ Which simple machine is a crane? (a) a pulley (b) a wheel and axle (c) a lever (d) an inclined plane
8. 8.⚙️ Which of these is a wheel and axle? (a) a doorknob (b) a bottle opener (c) a crowbar (d) a see-saw
9. 9.⚖️ 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 measure it (b) we change it (c) we keep it the same
10. 10.⚖️ A ruler balances on a pencil at its middle. You place 6 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?
11. 11.⚖️ What is the turning point of a lever called? (a) the axle (b) the fulcrum (c) the effort (d) the load
12. 12.True or false: a round pencil is not needed for the ruler lever. (a) False (b) True
13. 13.True or false: a steering wheel is an inclined plane. (a) True (b) False
14. 14.🔮 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) the right side (c) both go up (d) neither, it balances
15. 15.True or false: a slide uses a pulley. (a) True (b) False
16. 16.⚖️ 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) the number of coins (c) distance from the pencil
17. 17.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) impossible (c) easier (d) harder
18. 18.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
19. 19.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit closer to middle (c) sit on the middle (d) jump up and down
20. 20.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
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 change it (b) we keep it the same (c) we measure it
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.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
24. 24.True or false: a well pulley is an inclined plane. (a) False (b) True
25. 25.True or false: a sloping road uses a pulley. (a) False (b) True
26. 26.True or false: a balloon is not needed for the ruler lever. (a) True (b) False
27. 27.🛟 What is a safe way to use a ruler as a lever? (a) press it gently (b) stand on the ruler (c) bend it till it snaps (d) flick coins at faces
28. 28.⚖️ A ruler balances on a pencil at its middle. You place 5 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?
29. 29.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a 30 cm ruler (b) a round pencil (c) a flat table (d) yeast
30. 30.⚙️ Which of these uses a pulley? (a) a crowbar (b) a tap handle (c) a flagpole (d) a ramp
31. 31.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a flat table (b) coins of one kind (c) a magnet (d) a round pencil
32. 32.⚙️ Which of these is a lever? (a) a slide (b) a well pulley (c) a sloping road (d) a see-saw
33. 33.🛟 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
34. 34.⚖️ 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 number of coins (b) the same ruler (c) distance from the pencil (d) which side goes down
35. 35.True or false: a ramp is an inclined plane. (a) True (b) False
36. 36.True or false: a well pulley is a wheel and axle. (a) False (b) True
37. 37.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) turmeric powder (c) coins of one kind (d) yeast
38. 38.⚖️ 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) where the pencil is (c) the same ruler (d) which side goes down
39. 39.⚙️ Which simple machine is a sloping road? (a) an inclined plane (b) a pulley (c) a wheel and axle (d) a lever
40. 40.🧺 Which of these is needed for the ruler lever? (a) a battery cell (b) a balloon (c) turmeric powder (d) a round pencil

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