Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 292 · 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 uses a pulley? (a) a bottle opener (b) a steering wheel (c) a well pulley (d) a spoon lifting a lid
2. 2.🛟 What is a safe way to use a ruler as a lever? (a) flick coins at faces (b) stand on the ruler (c) bend it till it snaps (d) press it gently
3. 3.⚖️ 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
4. 4.⚖️ 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 same ruler (b) distance from the pencil (c) the kind of coins (d) which side goes down
5. 5.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a battery cell (c) a round pencil (d) a flat table
6. 6.⚖️ 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) where the pencil is (d) distance from the pencil
7. 7.⚙️ Which simple machine is a see-saw? (a) a lever (b) an inclined plane (c) a wheel and axle (d) a pulley
8. 8.🔮 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) the right side (d) both go up
9. 9.⚖️ What is the turning point of a lever called? (a) the effort (b) the load (c) the fulcrum (d) the axle
10. 10.🧺 Which of these is not needed for the ruler lever? (a) a balloon (b) a round pencil (c) coins of one kind (d) a flat table
11. 11.⚖️ Coins on the two sides balance when coins × distance is ___. (a) equal on both sides (b) bigger on the left (c) always 10 (d) zero
12. 12.⚖️ 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?
13. 13.True or false: a bottle opener is an inclined plane. (a) True (b) False
14. 14.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
15. 15.🧺 Do we need a round pencil for the ruler lever? (a) not needed (b) needed
16. 16.⚖️ A ruler balances on a pencil at its middle. You place 4 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?
17. 17.⚖️ 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 keep it the same (c) we change it
18. 18.⚖️ 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) True (b) False
19. 19.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a flat table (c) a round pencil (d) a balloon
20. 20.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a magnet (b) a flat table (c) coins of one kind (d) a 30 cm ruler
21. 21.True or false: a round pencil is not needed for the ruler lever. (a) True (b) False
22. 22.🧺 Do we need a balloon for the ruler lever? (a) needed (b) not needed
23. 23.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 6 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?
24. 24.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) turmeric powder (d) a 30 cm ruler
25. 25.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a battery cell (c) a 30 cm ruler (d) a magnet
26. 26.True or false: coins of one kind is needed for the ruler lever. (a) False (b) True
27. 27.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 3 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?
28. 28.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is the one thing we change. (a) True (b) False
29. 29.⚖️ On a see-saw, how can a light child balance a heavier child? (a) jump up and down (b) sit farther from middle (c) sit on the middle (d) sit closer to middle
30. 30.True or false: a tap handle is an inclined plane. (a) False (b) True
31. 31.🧺 Which of these is needed for the ruler lever? (a) coins of one kind (b) a balloon (c) turmeric powder (d) a magnet
32. 32.⚙️ Which simple machine is a crowbar? (a) a lever (b) a wheel and axle (c) an inclined plane (d) a pulley
33. 33.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they may swallow them (c) they are too shiny (d) they are magnetic
34. 34.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
35. 35.⚙️ Which of these uses a pulley? (a) a steering wheel (b) a slide (c) a crowbar (d) a flagpole
36. 36.⚖️ 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
37. 37.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) yeast (b) coins of one kind (c) a 30 cm ruler (d) a round pencil
38. 38.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) impossible (b) easier (c) the same (d) harder
39. 39.🧺 Do we need a mirror for the ruler lever? (a) not needed (b) needed
40. 40.True or false: turmeric powder is not needed for the ruler lever. (a) False (b) True

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