Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 614 · 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 6 coins 8 cm to the left of the pencil. How many coins must you place 12 cm to the right to balance it?
2. 2.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) False (b) True
3. 3.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) the same (b) easier (c) harder (d) impossible
4. 4.⚙️ Which of these uses a pulley? (a) a ramp (b) a slide (c) a spoon lifting a lid (d) a crane
5. 5.⚖️ 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
6. 6.⚙️ Which of these is a lever? (a) a crowbar (b) a flagpole (c) a ramp (d) a crane
7. 7.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) yeast (c) a round pencil (d) a mirror
8. 8.⚖️ 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 measure it (c) we keep it the same
9. 9.🧺 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 mirror
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) the right side (b) both go up (c) the left side (d) neither, it balances
11. 11.True or false: a well pulley is a lever. (a) True (b) False
12. 12.🛟 What is a safe way to use a ruler as a lever? (a) bend it till it snaps (b) flick coins at faces (c) press it gently (d) stand on the ruler
13. 13.⚖️ On a see-saw, how can a light child balance a heavier child? (a) sit farther from middle (b) sit on the middle (c) sit closer to middle (d) jump up and down
14. 14.🧺 Do we need a flat table for the ruler lever? (a) not needed (b) needed
15. 15.True or false: yeast is needed for the ruler lever. (a) True (b) False
16. 16.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a round pencil (c) a balloon (d) a 30 cm ruler
17. 17.⚖️ 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) which side goes down (c) distance from the pencil (d) the same ruler
18. 18.🛟 Why should coins be kept away from very small children? (a) they are too shiny (b) they may swallow them (c) they are magnetic (d) they are too cold
19. 19.🧺 Do we need yeast for the ruler lever? (a) not needed (b) needed
20. 20.True or false: a slide is an inclined plane. (a) False (b) True
21. 21.🧺 Which of these is not needed for the ruler lever? (a) coins of one kind (b) a 30 cm ruler (c) turmeric powder (d) a flat table
22. 22.🧺 Do we need a mirror for the ruler lever? (a) needed (b) not needed
23. 23.🧺 Which of these is needed for the ruler lever? (a) yeast (b) a balloon (c) a battery cell (d) a 30 cm ruler
24. 24.⚖️ 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) the number of coins (c) distance from the pencil (d) the same ruler
25. 25.True or false: a crowbar is a lever. (a) False (b) True
26. 26.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
27. 27.⚙️ Which of these is a wheel and axle? (a) a see-saw (b) a bottle opener (c) a tap handle (d) a crowbar
28. 28.🧺 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
29. 29.⚖️ 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
30. 30.⚖️ 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 change it (c) we measure it
31. 31.🧺 Do we need a 30 cm ruler for the ruler lever? (a) needed (b) not needed
32. 32.True or false: a balloon is needed for the ruler lever. (a) True (b) False
33. 33.⚙️ Which simple machine is a steering wheel? (a) a wheel and axle (b) an inclined plane (c) a lever (d) a pulley
34. 34.⚖️ Coins on the two sides balance when coins × distance is ___. (a) always 10 (b) zero (c) bigger on the left (d) equal on both sides
35. 35.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we change it (b) we keep it the same (c) we measure it
36. 36.⚖️ What is the turning point of a lever called? (a) the fulcrum (b) the load (c) the axle (d) the effort
37. 37.🧺 Which of these is needed for the ruler lever? (a) a mirror (b) yeast (c) a battery cell (d) a flat table
38. 38.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the number of coins is the one thing we change. (a) False (b) True
39. 39.⚙️ Which simple machine is a bottle opener? (a) a pulley (b) a lever (c) an inclined plane (d) a wheel and axle
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 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?

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